move vue and vue-calendar-heatmap to webpack (#10188)

- unvendor vue and vue-calendar-heatmap
- remove unused moment.js leftover from previous heatmap version
- ensure webpack loads the full version of vue
- fix vue devmode warning related to 'searchLimit' type

I wanted to name the chunk heatmap.js but adblockers don't like that
filename [1].

[1] 3899d5dff3/easyprivacy/easyprivacy_general.txt (L2095)

public/vendor/librejs.html

@@ -51,9 +51,9 @@
           <td><a href="https://github.com/bluef/gitgraph.js">gitgraph.js-latest</a></td>
         </tr>
         <tr>
-          <td><a href="./plugins/vue/vue.min.js">vue.min.js</a></td>
+          <td><a href="../js/index.js">vue</a></td>
           <td><a href="https://github.com/vuejs/vue/blob/dev/LICENSE">Expat</a></td>
-          <td><a href="https://github.com/vuejs/vue/archive/v2.6.6.tar.gz">vue.js-v2.6.6.tar.gz</a></td>
+          <td><a href="https://github.com/vuejs/vue/archive/v2.6.11.tar.gz">vue.js-v2.6.11.tar.gz</a></td>
         </tr>
         <tr>
           <td><a href="./plugins/emojify/emojify.custom.js">emojify.custom.js</a></td>
@@ -131,14 +131,9 @@
           <td><a href="https://github.com/swagger-api/swagger-ui/archive/v3.22.1.tar.gz">swagger-ui-v3.22.1.tar.gz</a></td>
         </tr>
         <tr>
-          <td><a href="./plugins/vue-calendar-heatmap/">vue-calendar-heatmap</a></td>
+          <td><a href="../js/userheatmap.js">vue-calendar-heatmap</a></td>
           <td><a href="https://github.com/WildCodeSchool/vue-calendar-heatmap/blob/master/README.md">MIT</a></td>
-          <td><a href="https://github.com/WildCodeSchool/vue-calendar-heatmap/archive/master.zip">7f48b20.zip</a></td>
-        </tr>
-        <tr>
-          <td><a href="./plugins/moment/">moment.js</a></td>
-          <td><a href="https://github.com/moment/moment/blob/develop/LICENSE">MIT</a></td>
-          <td><a href="https://github.com/moment/moment/archive/2.22.2.tar.gz">0.4.1.tar.gz</a></td>
+          <td><a href="https://github.com/WildCodeSchool/vue-calendar-heatmap/archive/master.zip">master.zip</a></td>
         </tr>
       </tbody>
     </table>