https://github.com/Virkkunen and I have been working on the same feature
simultaneously.
This patch adds my additional independent work on top of his changes.
Notable changes here compared to Virkkunen's original work:
- renaming config-related variables (`matrix_conduwuit_*` ->
`matrix_conduwuit_config_*`). This is consistent with other roles (and
better), but deviates from how the Conduit role was implemented.
- using a full configuration sample from https://conduwuit.puppyirl.gay/configuration.html
instead of using the old Conduit config file template
- introducing configurability for more Conduwuit config settings, to support easy registration, etc.
- removing configuration settings that Conduwuit does not support
anymore (e.g. `max_concurrent_requests`)
- cross-linking docs pages for Conduit and Conduwuit
- a Conduwuit docs page which is much improved compared to the old
Conduit one
- REAMDE updates
