Docs restructure

[ewels]

Results of a day's hacking by @mashehu and @ewels

Still a lot left to do, see project board: https://github.com/orgs/nf-core/projects/67/views/1

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[mashehu]

Sidebar is now working on everything and I tried to introduce a 3rd-level to the usage docs. We need to decide a place for the API docs, fix the merge conflicts and then we should be good to go for the first roll-out.

[mirpedrol]

Last comments :)

• The link to "join the community" here is outdated
• The link to the #test-data Slack channel is pointing to the wrong channel.

[jfy133]

My only remaining comment currently is that I strongly feel that we need to distinguish between ipeline users docs (of all kinds) vs pipeline developer docs (of all kinds).

I Personally feel splitting the current cards into two sections based on this is a worthwhile cause for that purpose, even if it makes the page a little londer.

But I give my approval as the general over haul is a good star in that direction

[ewels]

@mirpedrol - These links just go to the PR and not a specific location. Most of them I've been able to find myself, but I don't know where this one was.. Do you remember?

• The link to tools docs is broken

[ewels]

ok, merge conflicts fixed and (I think) all previous URLs still working / redirected in case they are referred to from anywhere.

Still more to do, but I think that this is as good as it's going to get for the merge on this PR.