Some Element Call setup resources say that `/.well-known/element/element.json` should be served on the base domain
and should contain content like this:
```json
{
"call": {
"widget_url": "https://call.element.example.com"
}
}
```
We were already generating the file via `matrix-static-files`, but weren't serving it yet.
This patch makes sure it's served on the `matrix.` domain, which allows
people to set up serving on the base domain via a redirect or reverse-proxying.
Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3562
This is a break in backward-compatibility for people disabling
`index.html` creation via the playbook but are managing their static
website files in another way (AUX role, etc).
This moves the comments from being just in Jinja,
to actually ending up in the generated `labels` file,
which makes inspection of the final result easier.
Also, some new lines were added here and there to make labels
more legible.
The generated file may still include weird new-lines due to
various `if` statements yielding content or not, but that's not so ugly
anymore - now that we have proper start/end sections that are visible in
the final `labels` file.
