* Support header HX-Push="false"
This is a tiny change that allows the `HX-Push` response header to obey "false" just like the `hx-push-url` attribute.
* Add documentation for hx-push response header
* Fix URL for move from `X-HX-` prefix to `HX-` - not sure if this would need a redirect.
* Cover all three `HX-Trigger-*` headers in the page.
* Remove some redundant redundancy in the list of response headers