Tuwunel serves the Synapse administration API under /_synapse/admin,
but the role only routed /_matrix, so admin dashboards and moderation
bots could not reach it. Add public and internal Traefik label groups
mirroring the matrix-synapse role, and enable them automatically when
Ketesa, Element Admin, or Draupnir is installed.

* Synapse Admin is Ketesa now!

* i18n changes

* add automatic migration

* fix migration version in vars

* add a note about routing for OIDC Auth

* mention v1.0.0 announcement blog post

* Update docs/container-images.md

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

* Update CHANGELOG.md

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

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