move semantic.dropdown.custom.js to webpack

Also disabled a annoying linter rule which insisted that imports can not
contain a file extension.

Fixes: go-gitea#8971

.eslintrc

@@ -25,14 +25,15 @@ globals:
   Vue: false
 
 rules:
+  arrow-body-style: [0]
   camelcase: [0]
   comma-dangle: [2, only-multiline]
   consistent-return: [0]
   default-case: [0]
   func-names: [0]
+  import/extensions: [0]
   max-len: [0]
   newline-per-chained-call: [0]
-  arrow-body-style: [0]
   no-alert: [0]
   no-continue: [0]
   no-mixed-operators: [0]

public/vendor/librejs.html

@@ -31,9 +31,9 @@
           <td><a href="https://github.com/Semantic-Org/Semantic-UI/archive/2.3.1.tar.gz">semantic-UI-2.3.1.tar.gz</a></td>
         </tr>
         <tr>
-          <td><a href="../js/semantic.dropdown.custom.js">semantic.dropdown.custom.js</a></td>
+          <td><a href="../js/index.js">semantic.dropdown</a></td>
           <td><a href="https://semantic-ui.mit-license.org/">Expat</a></td>
-          <td><a href="https://github.com/go-gitea/gitea/tree/master/public/js">semantic.dropdown.custom.js</a></td>
+          <td><a href="https://github.com/go-gitea/gitea/tree/master/web_src/vendor/semantic.dropdown">semantic.dropdown.custom.js</a></td>
         </tr>
         <tr>
           <td><a href="../js/index.js">index.js</a></td>

templates/base/footer.tmpl

@@ -118,7 +118,6 @@
 
 	<!-- JavaScript -->
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/semantic/semantic.min.js"></script>
-	<script src="{{StaticUrlPrefix}}/js/semantic.dropdown.custom.js?v={{MD5 AppVer}}"></script>
 	<script src="{{StaticUrlPrefix}}/js/index.js?v={{MD5 AppVer}}"></script>
 {{if .EnableHeatmap}}
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/moment/moment.min.js" charset="utf-8"></script>

templates/pwa/serviceworker_js.tmpl

@@ -7,7 +7,6 @@ var urlsToCache = [
   '{{StaticUrlPrefix}}/vendor/plugins/semantic/semantic.min.js',
   '{{StaticUrlPrefix}}/js/index.js?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/js/gitgraph.js?v={{MD5 AppVer}}',
-  '{{StaticUrlPrefix}}/js/semantic.dropdown.custom.js?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/vendor/plugins/clipboard/clipboard.min.js',
   '{{StaticUrlPrefix}}/vendor/plugins/vue/vue.min.js',
   '{{StaticUrlPrefix}}/vendor/plugins/emojify/emojify.custom.js',

web_src/js/index.js

@@ -2,8 +2,9 @@
 /* exported timeAddManual, toggleStopwatch, cancelStopwatch, initHeatmap */
 /* exported toggleDeadlineForm, setDeadline, updateDeadline, deleteDependencyModal, cancelCodeComment, onOAuthLoginClick */
 
-import './publicPath';
-import './gitGraph';
+import './publicPath.js';
+import './gitGraph.js';
+import '../vendor/semantic.dropdown/semantic.dropdown.custom.js';
 
 function htmlEncode(text) {
   return jQuery('<div />').text(text).html();