Periods shouldn't be a tab, but in the main header block
Period pages should have tabs for manuscripts and coteries
Nicer display of members in a coterie
Updating descriptions for a few pages
Everyone's favourite: favicons! Removing a bunch of superfluous ones and adding an SVG version, based off of the recommendations here https://css-tricks.com/how-to-favicon-in-2021/ (ignoring the apple touch icon and the PWA stuff).