docs: fix preview links

Author: JacobLinCool

README.md

@@ -2,22 +2,22 @@
 
 [![CodeFactor](https://www.codefactor.io/repository/github/jacoblincool/leetcode-stats-card/badge)](https://www.codefactor.io/repository/github/jacoblincool/leetcode-stats-card)
 
-A simple tool for every LeetCoder. Support both LeetCode and LeetCode CN.
-
 Show your dynamically generated LeetCode stats on your GitHub profile or your website!
 
+LeetCode and LeetCode CN are both supported.
+
 [Playground: Try It Now](https://leetcard.jacoblin.cool/)
 
 [![LeetCode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=unicorn&extension=activity)](https://leetcard.jacoblin.cool/JacobLinCool?theme=unicorn&extension=activity)
 
 ## Features
 
 - 📈 Clean and simple LeetCode stats, for both `us` and `cn` sites
-- 🎨 Multiple themes and 1,300+ fonts - [Theme](#theme-default-lightdark), [Font](#font-default-baloo2)
-- 🪄 Fully customizable using CSS - [Custom Stylesheets](#sheets-default-"")
+- 🎨 Multiple themes and 1,300+ fonts - [Theme](#theme-default-lightdark), [Font](#font-default-baloo_2)
+- 🪄 Fully customizable using CSS - [Custom Stylesheets](#sheets-default-)
 - ⚡️ Fast and globally edge network - [Cloudflare Workers](https://workers.cloudflare.com/)
 - 🚫 No tracking, controlable cache - [Cache](#cache-default-60)
-- 🍀 Open source
+- 🍀 Open source - [MIT License](./LICENSE)
 
 It also has a [NPM package](https://www.npmjs.com/package/leetcode-card) and a [highly extensible system](./src/core/index.ts), so you can easily customize it to your needs.
 
@@ -60,7 +60,7 @@ Data source, can be `us` or `cn`.
 ![](https://leetcard.jacoblin.cool/leetcode?site=cn)
 ```
 
-![](https://leetcard.jacoblin.cool/leetcode?site=cn)
+[![](https://leetcard.jacoblin.cool/leetcode?site=cn)](https://leetcard.jacoblin.cool/leetcode?site=cn)
 
 #### `theme` (default: `light,dark`)
 
@@ -73,7 +73,7 @@ Use a comma to separate the light and dark theme.
 ![](https://leetcard.jacoblin.cool/jacoblincool?theme=light,unicorn)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?theme=unicorn)
+[![](https://leetcard.jacoblin.cool/jacoblincool?theme=unicorn)](https://leetcode.com/jacoblincool)
 
 #### `font` (default: `Baloo_2`)
 
@@ -85,7 +85,7 @@ It is case-insensitive, and you can use `font=dancing_script` or `font=Dancing%2
 ![](https://leetcard.jacoblin.cool/jacoblincool?font=Dancing_Script)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?font=Dancing_Script)
+[![](https://leetcard.jacoblin.cool/jacoblincool?font=Dancing_Script)](https://leetcard.jacoblin.cool/jacoblincool?font=Dancing_Script)
 
 #### `width` and `height` (default: `500` and `200`)
 
@@ -97,7 +97,7 @@ But it will be helpful if you want to use custom css.
 ![](https://leetcard.jacoblin.cool/jacoblincool?width=500&height=500)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?width=500&height=500)
+[![](https://leetcard.jacoblin.cool/jacoblincool?width=500&height=500)](https://leetcard.jacoblin.cool/jacoblincool?width=500&height=500)
 
 #### `border` and `radius` (default: `1` and `4`)
 
@@ -107,7 +107,7 @@ Change the card border and radius.
 ![](https://leetcard.jacoblin.cool/jacoblincool?border=0&radius=20)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?border=0&radius=20)
+[![](https://leetcard.jacoblin.cool/jacoblincool?border=0&radius=20)](https://leetcard.jacoblin.cool/jacoblincool?border=0&radius=20)
 
 #### `animation` (default: `true`)
 
@@ -117,7 +117,7 @@ Enable or disable the animation.
 ![](https://leetcard.jacoblin.cool/jacoblincool?animation=false)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?animation=false)
+[![](https://leetcard.jacoblin.cool/jacoblincool?animation=false)](https://leetcard.jacoblin.cool/jacoblincool?animation=false)
 
 #### `hide` (default: `""`)
 
@@ -127,7 +127,7 @@ Hide elements on the card, it is a comma-separated list of element ids.
 ![](https://leetcard.jacoblin.cool/jacoblincool?hide=ranking,total-solved-text,easy-solved-count,medium-solved-count,hard-solved-count)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?hide=ranking,total-solved-text,easy-solved-count,medium-solved-count,hard-solved-count)
+[![](https://leetcard.jacoblin.cool/jacoblincool?hide=ranking,total-solved-text,easy-solved-count,medium-solved-count,hard-solved-count)](https://leetcard.jacoblin.cool/jacoblincool?hide=ranking,total-solved-text,easy-solved-count,medium-solved-count,hard-solved-count)
 
 #### `ext` (default: `""`)
 
@@ -143,7 +143,7 @@ Want to contribute a `contest` or `nyan-cat` extension? PR is welcome!
 ![](https://leetcard.jacoblin.cool/jacoblincool?ext=activity)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?ext=activity)
+[![](https://leetcard.jacoblin.cool/jacoblincool?ext=activity)](https://leetcard.jacoblin.cool/jacoblincool?ext=activity)
 
 #### `cache` (default: `60`)
 
@@ -155,8 +155,6 @@ Note: it will not be a good idea to set it to a long time because GitHub will fe
 ![](https://leetcard.jacoblin.cool/jacoblincool?cache=0)
 ```
 
-![](https://leetcard.jacoblin.cool/jacoblincool?cache=0)
-
 > You can make `DELETE` request to `/:site/:username` to delete the cache.
 
 #### `sheets` (default: `""`)
@@ -188,50 +186,50 @@ Now we have 6 themes. If you have any great idea, please feel free to open a PR!
 #### Light
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=light)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=light)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=light)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=light)](https://leetcard.jacoblin.cool/JacobLinCool?theme=light)
 
 #### Dark
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=dark)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=dark)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=dark)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=dark)](https://leetcard.jacoblin.cool/JacobLinCool?theme=dark)
 
 #### Nord
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=nord)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=nord)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=nord)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=nord)](https://leetcard.jacoblin.cool/JacobLinCool?theme=nord)
 
 #### Forest
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=forest)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=forest)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=forest)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=forest)](https://leetcard.jacoblin.cool/JacobLinCool?theme=forest)
 
 #### WTF
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=wtf)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=wtf)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=wtf)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=wtf)](https://leetcard.jacoblin.cool/JacobLinCool?theme=wtf)
 
 #### Unicorn
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=unicorn)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=unicorn)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&theme=unicorn)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?theme=unicorn)](https://leetcard.jacoblin.cool/JacobLinCool?theme=unicorn)
 
 ### Fonts
 
@@ -242,26 +240,26 @@ Some examples:
 #### Milonga
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&font=milonga)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?font=milonga)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&font=milonga)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?font=milonga)](https://leetcard.jacoblin.cool/JacobLinCool?font=milonga)
 
 #### Patrick Hand
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&font=patrick_hand)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?font=patrick_hand)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&font=patrick_hand)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?font=patrick_hand)](https://leetcard.jacoblin.cool/JacobLinCool?font=patrick_hand)
 
 #### Ruthie
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&font=ruthie)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?font=ruthie)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&font=ruthie)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?font=ruthie)](https://leetcard.jacoblin.cool/JacobLinCool?font=ruthie)
 
 ### Extensions
 
@@ -276,7 +274,7 @@ Want to contribute a `contest` or `nyan-cat` extension? PR is welcome!
 Show your recent submissions.
 
 ```md
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&ext=activity)
+![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?ext=activity)
 ```
 
-![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool&ext=activity)
+[![Leetcode Stats](https://leetcard.jacoblin.cool/JacobLinCool?ext=activity)](https://leetcard.jacoblin.cool/JacobLinCool?ext=activity)