- Reverts change to use sectionid on layouts (was unreliable), using config to make sure that's specified on all pages that need it
- Adds permalinks to all other pages so that og data is correct
- Corrects some permalinks that were in correct (translations)
Github doesn't let us handle 404s within a project repository, so we
handle them at the organization level. In order to handle graceully for
specific projects, we're setting up redirects to projects' own 404.html.