Collapse Swagger UI tags by default (#12428)

This makes is slightly faster to navigate through the swagger docs by
initially collapsing the tags like 'admin' or 'miscellaneous'.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: zeripath <art27@cantab.net>

web_src/js/standalone/swagger.js

@@ -18,6 +18,7 @@ window.addEventListener('load', async () => {
     spec,
     dom_id: '#swagger-ui',
     deepLinking: true,
+    docExpansion: 'none',
     presets: [
       SwaggerUI.presets.apis
     ],