Misc small improvements to Groups app

[rorysaur]

The new "Groups" app is for defining groups and their members, for multiple future uses, such as forming the team that owns an Adventure, a team application to a block, or a group of people who host a Convo series, etc.

It could use a few quality of life tweaks:

1. Add Kernel logo to top left of the navbar.
2. Set homeUrl so that clicking on the logo/title in the navbar takes you to the /browse page. (See Adventures or Explorer for an example of both logoUrl and homeUrl.)
3. Use the default footer with links to the other apps.
4. On the View view for a single group, list the name of each member along with their memberId (though we might remove memberId later if/when we don't need it anymore).
5. On the Edit form, the name seems to not be populating even when present. It should show up.

[rorysaur]

This task has been claimed by @youami