Add project integrations to nav
Add much of the contents of doc/user/project/integrations/
to the global Nav.
This is a little different to some of the other menus as:
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I like the Projects > Integrations navigations, but it limits how deep we can go. So I couldn't further split this Project services and Webhooks, with all the project services listed only under Project services. Instead, I've flattened the structure with Project services at the top.
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Not every available service has a docs page at this point. So I've added what we did have.
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There's a couple of files in
doc/user/project/integrations/
that didn't seem like good fits for the menu. For example: -
Not sure what to do with https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/project/integrations/prometheus_library/index.md.
At any rate, see what you think. Look ok?