LIBITD-2659. Add a "Group" main menu item

[aalston6]

Added a “Groups” main menu item which links to the group list page.

https://umd-dit.atlassian.net/browse/LIBITD-2659

[peichman-umd]

It looks like maybe the wrong files got committed or pushed, since I don't see the "Groups" item in the main menu. First thing I would suggest is to make sure your local main branch is up-to-date with umd-lib main (especially since there have been a lot of changes to it this afternoon):

git checkout main
git pull umd-lib main

Then create a new branch:

git checkout -b LIBITD-2659

Then you should only need to change the src/ipmanager/urls.py file to add "Groups" to the navigation links. Once that's done, added via git add, and committed, you should push to your fork and open a new PR.