Adding a readiness matrix of the various first party Backends

[zeryx]

This PR adds a support matrix of the various first-party Triton backends, and indicates which are the "recommended path" for new developers looking to explore Triton.

The table also links to the backends themselves, along with an end-to-end example showcasing how to "get started" with that backend.

[nnshah1]

@zeryx - a table of supported backends is a great idea. we are in the process of updating our docs to be able to pull in information from the backends into the generated html. as well. As it stands we'll have to review more and be thoughtful in the designations of quality and recommendation. Since we don't have documented standards (yet) - I'd want to hold off on merging something like this in order to avoid giving a false impression. I would first like us to document what recommended / alpha / ready / etc. mean

[zeryx]

@zeryx - a table of supported backends is a great idea. we are in the process of updating our docs to be able to pull in information from the backends into the generated html. as well. As it stands we'll have to review more and be thoughtful in the designations of quality and recommendation. Since we don't have documented standards (yet) - I'd want to hold off on merging something like this in order to avoid giving a false impression. I would first like us to document what recommended / alpha / ready / etc. mean

hey @nnshah1 that's great to hear. And fully agreed on what we should be declaring ready or recommended - I've updated to only contain "recommended" and "ready" for now. Let me know if you'd like to chat more about it!