[NO-ISSUE] Enable live reload of pages upon server restart

[tchoutri]

Proposed changes

This PR introduces a live reload websocket controlled by HTMX.
This requires us to switch to lucid2, for which some libraries are not yet compatible.

Opened tickets

• lucid2 support monadicsystems/lucid-alpine#4
• https://github.com/ocharles/lucid-svg
• Uncaught TypeError: htmx.defineExtension is not a function bigskysoftware/htmx-extensions#92

Contributor checklist

• My PR is related to <insert ticket number>
• I have read and understood the CONTRIBUTING guide
• I have inserted my change and a link to this PR in the CHANGELOG
• I have updated documentation in ./docs/docs if a public feature has a behaviour change

[tchoutri]

@TristanCacqueray I see in https://github.com/TristanCacqueray/haskell-xstatic/tree/main/demo-websockets-ki-htmx that you do not use the HTMX websocket extension. Is it worth it to do that myself or should I delegate as much work as possible?

[TristanCacqueray]

@tchoutri this was done in a earlier version of htmx which provided the extension out of the box, I think the latest version requires you to install the extension.

edit: actually this does use the extension, see the htmxExtWS value. Though for live reload purpose, that's not great, I think it's better to use SSE instead, that looks more reliable.

[tchoutri]

Oh nice! I'll explore the SSE option

[tchoutri]

Thanks a lot @MangoIV!