QOL Changes

Created by: shiimizu

• Fix NotFoundException not emitting HTTP 404 status code
• Fix theme on 404
• Cache templates for faster retrieval
• Simpler query patching for postgres
• Better titles (check your tabs on the browser)
• Just for now, use git revision as the version displayed in the docs
• Update requirements.txt based on a fresh virtualenv of python3.8
• Update demo