Builds out some images to use to identify repositories. Fixes T12825.
- Maniphest Tasks
- T12825: Allow setting of an image per repository
- rP83a89166ee33: Add profile images to Repositories
Try setting custom, built in, and null images.
3 of the icons are, https://github.com/primer/octicons/blob/master/LICENSE
Do we need to add a license somewhere for dirivitive?