Summary:
Adds links to manage team and go to billing account in
the org menu (opened by clicking the dropdown in the
top-left corner of Grist). Tweaks some wording of items
in both AppHeader and AccountWidget, and adds a link
to create a new team site to the Site Switcher in both
menus.
Also tweaks the UI of UserManager by adding
an animation when the manager is opened from the
doc access dialog.
Test Plan: Browser tests.
Reviewers: dsagal
Reviewed By: dsagal
Subscribers: dsagal
Differential Revision: https://phab.getgrist.com/D3121
