docs: update links to Vue 2 docs (vuestorefront#6626)

Author: filipsobol

packages/core/docs/README.md

@@ -39,9 +39,9 @@ Our list of supported and planned integrations on the [Integrations](./integrati
 
 The speed and flexibility of Vue Storefront wouldn't be possible without the great technologies that power it:
 
-- [Vue.js](https://vuejs.org/v2/guide/)
-- [Nuxt.js](https://nuxtjs.org/guide)
-- [SCSS](https://sass-lang.com/)
+- [Vue.js 2](https://v2.vuejs.org/v2/guide)
+- [Nuxt.js 2](https://nuxtjs.org/docs/get-started)
+- [SCSS](https://sass-lang.com/) (optional)
 - [Storefront UI](https://www.storefrontui.io/) (optional)
 - [TypeScript](https://www.typescriptlang.org/docs/home) (optional)
 - [Cypress](https://www.cypress.io/) (optional)

packages/core/docs/getting-started/introduction.md

@@ -34,9 +34,9 @@ Combining general-purpose modules from Nuxt.js and e-commerce specific modules f
 
 ## Start with Vue.js
 
-If you are new to the Vue.js ecosystem, the best place to start learning is the [Vue.js documentation](https://vuejs.org/). **In our documentation, we assume prior knowledge of Vue.js (with some exceptions)**. While we do our best to explain each topic in detail, a lack of this knowledge might cause you to get lost.
+If you are new to the Vue.js ecosystem, the best place to start learning is the [Vue.js 2 documentation](https://v2.vuejs.org/). **In our documentation, we assume prior knowledge of Vue.js (with some exceptions)**. While we do our best to explain each topic in detail, a lack of this knowledge might cause you to get lost.
 
-The next step in the learning process is reading [Nuxt.js documentation](https://nuxtjs.org/docs/). In most places, we don't assume this knowledge and add links to related documents, but having it will make you more confident and let you work faster and more efficiently.
+The next step in the learning process is reading [Nuxt.js 2 documentation](https://nuxtjs.org/docs/). In most places, we don't assume this knowledge and add links to related documents, but having it will make you more confident and let you work faster and more efficiently.
 
 ## What's next
 

packages/core/docs/getting-started/theme.md

@@ -48,7 +48,7 @@ Every new Vue Storefront project comes with a set of preinstalled Nuxt.js module
   <figcaption style="font-size: 0.9rem">(Click to zoom)</figcaption>
 </figure>
 
-Almost every page in our default theme uses components whose names start with `Sf`. These come from the [Storefront UI](http://storefrontui.io/) — a design system and library of Vue.js components dedicated to e-commerce, maintained by the Vue Storefront team. Every component can be heavily customized using [props](https://vuejs.org/v2/guide/components-props.html) and [slots](https://vuejs.org/v2/guide/components-slots.html).
+Almost every page in our default theme uses components whose names start with `Sf`. These come from the [Storefront UI](http://storefrontui.io/) — a design system and library of Vue.js components dedicated to e-commerce, maintained by the Vue Storefront team. Every component can be heavily customized using [props](https://v2.vuejs.org/v2/guide/components-props.html) and [slots](https://v2.vuejs.org/v2/guide/components-slots.html).
 
 Please check [Storefront UI documentation](https://docs.storefrontui.io/) to learn more and interactively customize and test the components.