The nginx instance which is serving the .well-known endpoints can serve
the simple JSON replies directly from memory, instead of having them
as external files on disk.
- Dockerfile now tracks the gitlab repository and the master branch.
- docker-compose now points to conduit.toml instead of Rocket.toml and
its env vars were also renamed from ROCKET_ to CONDUIT_.
Furthermore vectorim/riot-web was changed to vectorim/element-web