Documentation: introduce clickable tooltips to copy hx url

[jheinath]

Hey there,

regarding to @dtchepak's last comment in my recent PR (#729) I implemented his additional feature request:

I have a feature request if you get time to look at it: clicking the headings auto-copies to clipboard, but if people don't have a clipboard manager this might wipe out something they wanted to keep. It might be handy to have a "copy to clipboard" link appear on hover that will do this

preview-ui.mp4

otherwise just clicking the heading to jump to the anchor is probably sufficient (people can copy the url from the address bar).

-> still works like before, but clicking on the header itself does no longer copy to clipboard. Only possible via the tooltip.

Please kindly take a look and give your feedback! Thanks!

[dtchepak]

Thanks! I'm happy to merge as-is, or can apply @304NotModified's suggestion first (or in a different PR). Let me know which you prefer. 👍

[jheinath]

Thanks! I'm happy to merge as-is, or can apply @304NotModified's suggestion first (or in a different PR). Let me know which you prefer. 👍

Added @304NotModified suggestion, thx for the hint! 👍

@dtchepak you may merge when it fits for you, thanks as well!

[dtchepak]

Change is live. Thanks @jheinath and @304NotModified! 🙇