Split index.js to separate files (#17315)

* split `index.js` to separate files

* tune clipboard

* fix promise

* fix document

* remove intermediate empty file

* fix async event listener

* use `export function` instead of `export {}`, add more comments

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>

Author: 3 people

docs/content/doc/developers/guidelines-frontend.md

@@ -39,13 +39,6 @@ We recommend [Google HTML/CSS Style Guide](https://google.github.io/styleguide/h
 6. The backend can pass complex data to the frontend by using `ctx.PageData["myModuleData"] = map[]{}`
 7. Simple pages and SEO-related pages use Go HTML Template render to generate static Fomantic-UI HTML output. Complex pages can use Vue2 (or Vue3 in future).
 
-## Legacy Problems and Solutions
-
-### Too much code in `web_src/index.js`
-
-Previously, most JavaScript code was written into `web_src/index.js` directly, making the file unmaintainable.
-Try to keep this file small by creating new modules instead. These modules can be put in the `web_src/js/features` directory for now.
-
 ### Vue2/Vue3 and JSX
 
 Gitea is using Vue2 now, we plan to upgrade to Vue3. We decided not to introduce JSX to keep the HTML and the JavaScript code separated.

templates/repo/branch/list.tmpl

@@ -125,7 +125,7 @@
 											{{if .IsDeleted}}
 												<a class="ui basic jump button icon poping up undo-button" href data-url="{{$.Link}}/restore?branch_id={{.DeletedBranch.ID | urlquery}}&name={{.DeletedBranch.Name | urlquery}}" data-content="{{$.i18n.Tr "repo.branch.restore" (.Name)}}" data-variation="tiny inverted" data-position="top right"><span class="text blue">{{svg "octicon-reply"}}</span></a>
 											{{else}}
-												<a class="ui basic jump button icon poping up delete-branch-button" href data-url="{{$.Link}}/delete?name={{.Name | urlquery}}" data-content="{{$.i18n.Tr "repo.branch.delete" (.Name)}}" data-variation="tiny inverted" data-position="top right" data-name="{{.Name}}">
+												<a class="ui basic jump button icon poping up delete-button delete-branch-button" href data-url="{{$.Link}}/delete?name={{.Name | urlquery}}" data-content="{{$.i18n.Tr "repo.branch.delete" (.Name)}}" data-variation="tiny inverted" data-position="top right" data-name="{{.Name}}">
 													{{svg "octicon-trash"}}
 												</a>
 											{{end}}