Add gitiles lister

Not sure if there are other instances than https://android.googlesource.com/ but this is a significant one.

swh/devel/swh-lister!487 (merged): Implementation
swh/devel/swh-environment!273 (merged): List various instances in docker (see mr description)
Deploy in staging
Deploy in production
(ongoing) List and ingest instances
swh/devel/swh-web!1161 (merged): Reference in archive coverage widget and add type to add-forge-now ui

Edited Aug 04, 2023 by Antoine R. Dumont

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information