Improve inline docs

[ealmloff]

The dioxus docsite is pretty good at getting you started with dioxus, but our inline and docs.rs docs are currently pretty sparse in comparison. This PR improves the inline docs for the core, html, hooks, and signals crates

Goals:

• Provide more examples for common items
  • eval examples
  • onmounted examples
  • attributes rsx syntax
  • elements rsx syntax
  • resource
  • memo
  • reactivecontext
  • Routable
  • FromQuery
  • FromQueryArgument
  • FromRouteSegment
  • FromRouteSegments
  • ToRouteSegments
  • use_effect
  • rsx
• Make common items more discoverable with doc(alias)
  • aliases for html names -> rust names on attributes
  • use_state -> use_signal
  • ref -> onmounted
• Improve trait not implemented errors with diagnostics
  • closure maybe async return
  • props not implemented
  • component not implemented
  • Routable/FromQuery/FromQueryArgument/FromRouteSegment/FromRouteSegments/ToRouteSegments
  • Dependency
• Provide better references for common errors on methods where they can occur
  • event handle errors
    • function requires argument type to outlive 'static
    • use of moved value: your_value value used here after move
  • spawn errors
    • async block may outlive the current function, but it borrows value, which is owned by the current function
    • use of moved value: value. move occurs because value has type YourType, which does not implement the Copy trait
• Update dioxus crate readme
  • Mention renderer features, signals, and the router
  • Don't go into detail about custom hooks etc. Just link to more complete docs

Fixes #2390

[jkelleyrtp]

Wow. So much work went into this.

At some point we should propagate more of this onto the guide itself too.