feat(teal): add PDS #33

We'd like to move off bluesky's PDS, and the obvious candidate is to set up our own...

...we've chosen to have our handles *.at.freshlybakedca.ke because they are technically publicly visible - although we expect to be using custom domains for most/all accounts on this PDS

...we've chosen to have the pds at pds.freshly.space because, like files.freshly.space, while technically publicly usable (file shares or accessing our bsky accounts), it is only going to host accounts of friends and patissiers of freshlybakedca.ke. There is no process to get an account on our PDS as a general member of the public. It also isn't generally particularly visible in public UIs. (This criteria also means that spindle.freshlybakedca.ke should be at spindle.freshly.space, which we will migrate in the future. Other than that everything we host meets this criteria)

This is part of a series of atproto migration patches. Our plan so far is:

Set up a tangled.org spindle
Set up a PDS ^ You are here
Set up email for our PDS
Set up a tangled.org knot
Pull in upcoming external idp patches for PDS
Rename tangled.org spindle to spindle.freshly.space