Use shields for crates version

Fixes #260
Replaces #293

Author: bilelmoussaoui

_data/crates.json

@@ -1,38 +1,29 @@
 [
   {
     "section": "Core",
-
     "name": "cairo-rs",
-    "max_version": "0.17.10",
     "repo": "gtk-rs-core"
   },
   {
     "name": "gio",
-    "max_version": "0.17.10",
     "repo": "gtk-rs-core"
   },
   {
     "name": "glib",
-    "max_version": "0.17.10",
     "repo": "gtk-rs-core"
   },
   {
     "name": "pango",
-    "max_version": "0.17.10",
     "repo": "gtk-rs-core"
   },
   {
     "section": "GTK 3",
-
     "name": "gtk",
-    "max_version": "0.17.1",
     "repo": "gtk3-rs"
   },
   {
     "section": "GTK 4",
-
     "name": "gtk4",
-    "max_version": "0.6.6",
     "repo": "gtk4-rs"
   }
 ]

_includes/crates.html

@@ -14,7 +14,7 @@
       </a>
     </td>
     <td>
-      v{{crate.max_version}}
+      <img src="https://img.shields.io/crates/v/{{crate.name}}?style=for-the-badge&labelColor=fff&color=83469B&label=" alt="{{crate.name}}" />
     </td>
     <td class="docs">
       <a href="/{{crate.repo}}/stable/latest/docs/{{ crate.name | replace: "-rs", "" }}">