Refactor: Use the htmx-go package

[tylermmorton]

The torque framework has its own htmx package, mostly containing logic to wire up WebSockets and SSE into torque.

Recently a new package was released called htmx-go that is a much more comprehensive implementation of htmx related features.

We should determine which logic in the torque htmx package can be deprecated and replaced.

Tasks:

• [ ] Investigate the htmx-go package and update the docsite implementation to use it.
• [ ] Deprecate all exported functions and constants in pkg/htmx/headers.go