!aaabaa is used as an example of a room ID on https://spec.matrix.org/v1.12/#room-aliases

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

!qporfwt is used as an example of a room ID on https://spec.matrix.org/v1.12/#room-structure

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

- Sync list of mailbox to Matrix mappings
- Add explanation for each variable

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Overall the playbook uses the expression "Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file:" with the heading "Adjusting the playbook configuration" for sections to explain what to be added as variables

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

`matrix_homeserver_container_url` is potentially wrong in certain
scenarios (going through `matrix-homeserver-proxy`).

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2090

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2043