Internal qa updates

[joshdarby]

Changes

This pull request makes the following changes:

• Makes 0.5rem margin be on all tags on the list holder items instead of all but the first and switches it from margin-left to margin-right so it's inline with the content
• Adds 6px left and right padding to project statuses on the single view
• Adds 1rem bottom margin to images and videos
  
• Makes expanded category holder 175px wide instead of 100% so it doesn't cover everything
  
• Adds support for excerpt in projects custom post type

Why

For #143

Testing/Questions

Features that this PR affects:

• Tags/categories on the list items
• Images and videos
• Category filter
• Project excerpt field

Questions that need to be answered before merging:

• Is this PR targeting the correct branch in this repository?

Steps to test this PR:

1. Poke around and make sure everything looks ok
2. Make sure the excerpt field is visible in the project post editor