Utilize django include for HTTP URLs

[Archmonger]

• fix Fix antipattern with IDOM_WEB_MODULE_PATH #37
• Follows Django conventions for HTTP URLs. Allows us to add more in the future when needed.
• Major overhaul of the readme to improve readability.
• Expose IdomWebsocket at the module level to encourage type hinting
• Removes IDOM_BASE_URL as it was difficult to use in conjunction with Django base URLs

While this is a breaking change, I don't think mitigations are necessary since it seems like no one besides Conreq is currently using django-idom on GitHub.

[Archmonger]

On a tangent, do you think there's a chance we'll ever need more than one websocket endpoint for this repo?

If so I can make similar changes on the WS end.

Django channels is pretty new so there isn't any good styling guidelines to use for how to accomplish this.

[rmorshea]

I don't think so since one WS can serve any number of views.