* Draupnir 2.0.0

The config getting changes all over the place is because of 2.0 having removed a lot of config options due to the code being removed.

* Update Draupnir Documentation to reflect state as of 2.0.0

* Apply Review Feedback

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Change Room IDs found in code review to not conform to playbook standard.

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Further Integrate Code Review Feedback

* Apply remaining suggestions from code review.

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Apply Configuration Review Feedback

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Add Self Registration and Native Login to Draupnir

* Rework Draupnir Documentation to Remove Pantalaimon

* Set bot.draupnir as default username for the bot in config

* Draupnir 2.0.1

* Integrate Review Feedback on Structure of Docs

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Further Restructure Docs and tweak variables in response.

* Only auto-create draupnir user if a password has been set

The Draupnir role supports configuring it with either an access token or with a password.

When a password is not assigned (which means the access token mode is used), the user is to be created manually.

* Add ensure-matrix-users-created tag

Now that the Draupnir user may be auto-created in certain configurations (if a password is assigned), it's useful to have the tag there.

---------

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>
Co-authored-by: Slavi Pantaleev <slavi@devture.com>

This is actually authored by Julian Foad here
(https://lab.trax.im/matrix/matrix-docker-ansible-deploy), but was in
need of a rebase and various adjustments caused by huge playbook
refactoring that landed in the past months.

This rework is completely untested.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/266

main.yml is not included due to that its changed separately.

This paves the way for installing other roles into `roles/galaxy` using `ansible-galaxy`,
similar to how it's done in:

- https://github.com/spantaleev/gitea-docker-ansible-deploy
- https://github.com/spantaleev/nextcloud-docker-ansible-deploy

In the near future, we'll be removing a lot of the shared role code from here
and using upstream roles for it. Some of the core `matrix-*` roles have
already been extracted out into other reusable roles:

- https://github.com/devture/com.devture.ansible.role.postgres
- https://github.com/devture/com.devture.ansible.role.systemd_docker_base
- https://github.com/devture/com.devture.ansible.role.timesync
- https://github.com/devture/com.devture.ansible.role.vars_preserver
- https://github.com/devture/com.devture.ansible.role.playbook_runtime_messages
- https://github.com/devture/com.devture.ansible.role.playbook_help

We just need to migrate to those.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1939