Doc links take nowhere

I got a hint printed when running a `lightning.Trainer` object, which sent me to the `PyPi` page for litModels. There is a link to documentation there which points to the non-existing https://lightning-ai.github.io/litModels/

Coming to the repo here in GitHub, the "Docs" link in the readme points at
https://lightning.ai/docs/overview/model-registry

which also doesn't seem to exist, and redirects to the "getting started" documentation for pytorch lightning.

I find it very bad manners to use one product to advertise another, and I find it particularly annoying when said advertised product is not even properly documented. Please set a proper documentation place for this project, or otherwise stop plugging it into other projects until there is a reasonable way of reading what the suggestion is about.

Start by checking the documentation links in the README, the PyPI page for litModels, and the hint printed by a lightning.Trainer object. Determine whether this project has a supported documentation location or whether the references should be removed; done means the remaining links resolve to relevant project documentation.

Written by the indexing model from the issue text.