Add Matrix .well-known config for beta
Add Matrix .well-known
config for beta, https://beta.gitter.im/.well-known/matrix/server
- Part of https://github.com/matrix-org/matrix-hosted/issues/2336
- MR where we added
.well-known
for prod: https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/2031
Edited by Eric Eastwood