[repo] Update code owners

[andrewnicols]

The @moodle/iteam team is a secret team and can't be used in code owners.
I have:

• created a new documentation-owners team to replace iteam
• added the existing mobile-developers team to the app locations
• added a new content-authors team with Julia for the content guidelines section
• added a new community team for the community section

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[sarjona]

Hi @andrewnicols!
Thanks for working on this! The new groups definitely make more sense. I was wondering though – should these groups also be created within this repository? Perhaps I've missed something in the plan? :-)