* Clean up and fix clone button script (#20415)
The button 'primary' class needs to be set in a synchronous script to prevent flicker of the button which was regressed recently, fixed that.
Additionally, reduced the two script tags to just one, the previous scripts were actually initializing the buttons thrice on the empty repo page, now it only initializes once. Finally, removed duplicate code and re-used the inline function in the update code as well.
I had to split out the script into a separate template as on the empty repo page, the script needs access to the clone URL span in the example text, which is rendered below the clone buttons, so buttons and script could not be combined.
* Add default value for clone URLs
Default clone URLs to HTTP(S) in DOM rendering. JS will immediately
replace this if the user preference is SSH.
Fixes: https://github.com/go-gitea/gitea/issues/20558
The last PR about clone buttons introduced an JS error when visiting an empty repo page:
* https://github.com/go-gitea/gitea/pull/19028
* `Uncaught ReferenceError: isSSH is not defined`, because the variables are scoped and doesn't share between sub templates.
This:
1. Simplify `templates/repo/clone_buttons.tmpl` and make code clear
2. Move most JS code into `initRepoCloneLink`
3. Remove unused `CloneLink.Git`
4. Remove `ctx.Data["DisableSSH"] / ctx.Data["ExposeAnonSSH"] / ctx.Data["DisableHTTP"]`, and only set them when is is needed (eg: deploy keys / ssh keys)
5. Introduce `Data["CloneButton*"]` to provide data for clone buttons and links
6. Introduce `Data["RepoCloneLink"]` for the repo clone link (not the wiki)
7. Remove most `ctx.Data["PageIsWiki"]` because it has been set in the `/wiki` middleware
8. Remove incorrect `quickstart` class in `migrating.tmpl`
In the case of misuse or misunderstanding from a developer whereby,
if `sel` can receive user-controlled data, jQuery `$(sel)` can lead to the
creation of a new element. Current usage is using hard-coded selectors
in the templates, but nobody prevents that from expanding to
user-controlled somehow.
* Add fallback href link
* Switch async archive generation to use href links
* Edit all templates to use href instead of data-url for archives
* Add consistent rel="nofollow" as per wxiaoguang
