The first step of #23328
This PR cleans:
1. Dead function like `SubStr`
2. Unnecessary function like `UseHTTPS`, it should be provided by
`window.origin`
3. Duplicate function like `IsShowFullName`, there was already a
`DeafultShowFullName`
I have searched these removed functions globally, no use in code.
Follow #21986
Even if the ROOT_URL is incorrect, the clone URL on the UI should be
correct.
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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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.
