Reorganize frontend files and tooling (#10168)

- move "vendor" files to js/vendor and less/vendor
- move swagger to js/standalone (meant for standalone pages)
- move gitgraph to features and streamline its loading
- add linting configs to webpack dependencies in make
- set ignored files for eslint/stylelint directly in their configs

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

web_src/js/index.js

@@ -5,10 +5,11 @@
 import 'jquery.are-you-sure';
 import './publicPath.js';
 import './polyfills.js';
-import './gitGraphLoader.js';
-import './semanticDropdown.js';
+import './vendor/semanticDropdown.js';
+
 import initContextPopups from './features/contextPopup.js';
 import initHighlight from './features/highlight.js';
+import initGitGraph from './features/gitGraph.js';
 
 import ActivityTopAuthors from './components/ActivityTopAuthors.vue';
 
@@ -2578,6 +2579,7 @@ $(document).ready(async () => {
   initRepoStatusChecker();
   initTemplateSearch();
   initContextPopups(suburl);
+  initGitGraph();
 
   // Repo clone url.
   if ($('#repo-clone-url').length > 0) {