Tutor

- [Improvement] Add `k8s-deployments-nginx-volume-mounts` patch.
- [Bugfix] Fix running forum locally when both Elasticsearch and MongoDB are not activated (266).
- [Bugfix] Fix MongoDB URL in the forum when running a separate service (267).
- 💥[Improvement] Better `dev` commands, with dedicated development docker image. One of the consequences is that the `dev watchthemes` command is replaced by `dev run lms watchthemes`.
- [Improvement] `images` commands now accept multiple `image` arguments.

- [Bugfix] Fix missing requirements file in PyPI package (261).
- [Improvement] Add missing cms/lms production/development setting patches.
- [Improvement] Allow SigV4 authentication for video upload to S3.
- [Bugfix] Fix cms development settings.

- [Improvement] Upgrade openedx locales to Ironwood.

- [Improvement] Properly set studio title (246).
- [Improvement] Enable Mysql strict mode.

- [Feature] Introduce tutor docker image.
- [Feature] Introduce `local hook` command for plugin development.
- [Bugfix] Persist `private.txt` file between two runs of `config save` (247).
- [Improvement] Added configuration values to limit the number of gunicorn workers for the LMS and CMS.

- 💥[Improvement] Get rid of mysql-client container.
- [Improvement] Add "local-docker-compose-lms/cms-dependencies" plugin patches.
- [Improvement] Use "exec" instead of "run" to initialise local platform.