docs: align docs with template

[VeraChristina]

Description

• Add reference to main anemoi contributing guidelines
• remove empty sections from docs
• Align section titles with template

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📚 Documentation preview 📚: https://anemoi-inference--195.org.readthedocs.build/en/195/

[aaron-hopkinson]

Again, looks good - thank you.

As with the graphs/datasets PRs there's the potential for some inconsistency Re: command line tool/usage (see ecmwf/anemoi-core#219).

I also noticed a few small issues on the index page, e.g.

• The "About Anemoi" text is included twice.
• The quick overview has a link which isn't rendering properly ("generating your first forecast")
• The link to the main docs index page is also broken (as with datasets/graphs PRs).

Not sure if you want to tackle those in this PR, or we can do this in a follow-on.

[VeraChristina]

As with the graphs/datasets PRs there's the potential for some inconsistency Re: command line tool/usage (see ecmwf/anemoi-core#219).

I have reverted the corresponding change in graphs for consistency.

I also noticed a few small issues on the index page, e.g.

* The "About Anemoi" text is included twice.

Removed and changed the layout to match that of graphs. Also removed the sentence that seems to have been copied from anemoi-utils.

* The quick overview has a link which isn't rendering properly ("generating your first forecast")

* The link to the main docs index page is also broken (as with datasets/graphs PRs).

Both fixed

[aaron-hopkinson]

Thank you 😄