Collection categories are broken

[jefftriplett]

This is apparently a Jekyll bug, but collections use their sub-folder names as their category even if you specify one. That causes our https://2022.djangocon.us/speaking/twitter/, our youtube meta info, and other pages to show rooms and other info we don't need for tweeting about talks.

The only solution I can think of is:

• add another "name for category"
• add the field to our process.py models
• setup an __init__ to fill in "name for category" if it's blank
• re-run this script for our project
• update speaking* templates to look for this new field instead of category
• publish!

[jefftriplett]

Re-opening until we look over a better permalink fix.