This diff puts all the community header components I built in previous diffs and introduces it as the community header component. Just also want to note that this diff also includes some "hacky" logic I introduced to test the two main states of this header:
1. When home/all communities is selected (there should be no community action buttons and the header should say "All communites")
{F1013715}
2. When a community is selected (the name/avatar of the community should be in the header and the community action buttons should be rendered)
{F1013716}
Linear task: https://linear.app/comm/issue/ENG-5965/top-bar-when-a-community-is-selected and https://linear.app/comm/issue/ENG-5964/top-bar-when-inboxhome-is-selected