Extension docs: npm, bundler, min/unmin and SRI hash instructions

[marisst]

Pull request should be viewed together with the corresponding PR in htmx-extensions repository bigskysoftware/htmx-extensions#123.

Documentation is updated to elaborate on extension installation and integration. Until now, extension installation instructions were limited to a CDN script tag. This change adds:

• guidance on installation with npm
• guidance on integration with bundlers
• instructions to access minified and unminified extension versions
• SRI hash in CDN script tag installation example
• links to newest extension versions which were released with the htmx.org@2.0.4 release
• makes the need of hx-ext clearer Extensions documentation could make need for hx-ext clearer #2475

[marisst]

@Telroshan please don't review it yet. I converted to draft. Unfortunately I realised it won't be as easy as this. When integrating an extension with import statement, we need to figure out how to inject htmx in the scope of the extension. I think we also need to update all extension package definitions to make htmx.org a required dependency. I will need to investigate how this is done in other JS libraries. If you have good examples let me know.

[Telroshan]

Don't worry @marisst , I'm terribly ignorant about this topic anyway so I will likely not be the one to review this 😆

[marisst]

@Telroshan Okay. It's all ready for review now. Do you know who are the most relevant reviewers for this type of change?