feat: Report posts

[aaga]

Adds a modal dialog flow for reporting posts. Mostly mimics the stock Mastodon web app implementation.

Note: this PR rolls in the changes from an existing open PR for menu UI: #1673. If this PR is merged, #1673 can be closed as well.

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[patak-dev]

Looks good to me @aaga! And great to see Mozilla interested in Elk and in contributing.

I don't know how to properly test this one without reporting someone, so maybe we should merge so we get it deployed to https://main.elk.zone and let others use the reporting tool to check it out.

Something I think we could change before merging is making the dialog wider on desktop. The Next button was after the fold in some cases with the current width

[aaga]

Thanks for the feedback @patak-dev. I increased the max-width of the dialog a bit; ultimately the number and length of server rules will determine how far down the Next button is, but hopefully this new width helps make things feel a little less cramped.

And yes, merging for testing on https://main.elk.zone sounds good!

[patak-dev]

A lot better now! I'll approve it and leave some time for others to check it out. If we don't see other comments, we could merge tomorrow and test it for a bit on https://main.elk.zone.