Feature request: make machine learning and graph tabs switchable

[dgloeckner]

I guess both of those tabs require a backend and at least for our use case of a standalone lightweight ClickHouse UI they don't make sense.

It seems to be fairly easy to make those switchable, e.g. via env variables.

I could work on a PR if there's the chance for it to get merged.

[dgloeckner]

I made the tabs switchable in my fork.

Please see https://github.com/dgloeckner/ClickCat/tree/improve-ux