Write a script to partially automate updating lego

Whenever something in lego gets updated, all of the sites need to update the submodule, commit, and push. This has eaten a lot of time in the past. It isn't hard, just slow.

I'll be writing a script to automate updating lego for all the sites. The flow will look something like this:

for each web repo:

1. checkout a new branch named update-lego-{lego_hash} that tracks origin/main
2. cd into the lego directory
3. git pull origin main ; cd ..
4. add the lego directory, commit, and push to a new branch on the remote
5. print merge request URLs and errors