add release notes

release/0.3.0+0.64.3

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+WARNING: This is a breaking release, you will certainly need to read this & fix
+your config to have a successful deployment! There has been a lot of churn on
+this recipe due to the experimental nature of getting things up and running.
+We're hoping things will stabilise soon. It's a lovely software after all and
+users are enjoying using it.
+
+- Additional login methods have been added e.g. Google (yep...). You now need
+  to make a choice of which authentication you want to make. This can be done by
+  using the usual `$AUTH_ENABLED=1` environment variable condition.
+
+- If you were using the generic OpenID Connect authentication method (e.g.
+  Keycloak, Authentik) then you will now need to use
+  `COMPOSE_FILE=compose.yml:compose.oidc.yml` and provide the `OIDC_*`
+  environment variables in your `.env` file. See the recipe `.env.sample` for
+  more.
+
+- We are no longer using a fork of Outline for the recipe (yay!). If you were
+  using the old patched version, you'll have to deal with some migration issues.
+  See https://git.coopcloud.tech/coop-cloud/outline#deleting-a-user-e-g-to-fix-sso-weirdness
+  for more.
+
+There has been a lot of changes. Please add to this file if you see more
+weirdness to help the rest of the Co-op Cloud Comrades.
+
+@decentral1se (Autonomic Co-op)