HTMX issues

[FroMage]

• I wanted to delete an element after an htmx call, and so from the POST method I returned null and set hx-swap="delete" but 204 responses don't lead to a deletion from htmx. I have to make my endpoint return something. We should find out how to fix this. Or at least an empty TemplateInstance that leads to a 200 instead of a 204 (as is the case when returning null).
• I have to choose between extending HxController or ControllerWithUser since they're both classes. This is not ideal since in my case I want both.
• Our docs should show an example of this
• Our docs should show an example of how to import HTMX from their HTML, such as with a CDN, or web-bundler
• Our docs should show validation examples for HTMX
• Perhaps we should remove the redirects on POST for HTMX? They don't need to be safe from reloads like regular HTTP.