Docs feat request: Modules, Optimizers, LMs, RMs should have links back to the source code somewhere on the page

[isaacbmiller]

This is an opinion, but it would be great if the different signatures had links back to source code.

E.g. https://dspy-docs.vercel.app/deep-dive/modules/react/ should link back to https://github.com/stanfordnlp/dspy/blob/main/dspy/predict/react.py

[isaacbmiller]

cc @krypticmouse thoughts?

[krypticmouse]

Good idea, we might have API refs back at some point and when that happens we can probably add this in them?

[okhat]

cc'ing also @ammirsm