Implements display and editing of project "authors" (contributors/maintainers).
Authors are shown as a series of chips below the Website and Repository links. They contain the name and avatar only.
Authors are input by e-mail in the new/edit project modals. Currently, only logged-in users can be made authors, as it was technically easier to implement.
The project view itself has been somewhat tweaked to be more responsive and visually pleasing.
Project models now have unique input IDs, something accidentally ignored in #24.
Implements display and editing of project "authors" (contributors/maintainers).