Replace frigate with helm-docs

[nineinchnick]

Use pre-commit so developers can use a git hook to regenerate docs.

I replaced frigate with helm-docs because frigate's pre-commit hook requires conda to install it. helm-docs run from a Docker container.

Also update all GitHub actions and enable Dependabot.

[mosabua]

In principal I am good with this change .. however.. the rendered output does not show and description anymore.. I am hoping we can somehow make the docs for all the values more useful. Can we somehow fix this?

In fact I am contemplating adding a website similar to how we just got it added in the Trino Gateway repo .. so we can write some useful docs for the charts that go beyond what we have in the Trino docs themselves.

[mosabua]

Also .. if helm-docs is good .. we want to look at adding its usage for the Trino Gateway chart in the trino-gateway repo.

[nineinchnick]

@mosabua I've used a custom template to print all values as a definition list instead of a table. I included those large examples that wouldn't fit in the table well. I also filled in most descriptions with links to Kubernetes and Trino documentation, where relevant. Please review.

[mosabua]

This is a massive improvement. I think we should merge and then we can refine more going forward in terms of specific wording other nits in separate PRs.