* Add CardDav and CalDav servers
This implements the servers, but not the clients (yet). The implementation is essentially a proxy to Radicale (as a container in `docker-compose.yml`), with certain security assurances.
If you're upgrading, basically you'll need to create a new `data-radicale` directory, and everything else should just work.
This will also release v2.3.0 with those enabled by default. Tested with Thunderbird and Apple Calendar + Contacts.
To disable these, simply add the new config details and comment out or don't add the new `radicale` service from `docker-compose.yml`.
Related to #56
This means we now need to have the text and HTML content set in the code, which is arguably better.
In order to avoid allowing legacy Brevo API Key support, this will also introduce breaking changes and will be released as v2.0.0.
I took the opportunity to remove a few deprecated things (like legacy ENV-based config), upgrade PostgreSQL, and pin a specific version in `docker-compose.yml`, since I don't plan to do breaking releases anytime soon, and upgrading PostgreSQL should be fine from now on if the version is pinned.
If you were using Brevo with an API Key, they support SMTP as well, just update your config.
If you were using ENV-based config, check `bewcloud.config.sample.ts`to create your `bewcloud.config.ts`.
If you need help upgrading you PostgreSQL container, I've written a simple guide [step-by-step guide](https://news.onbrn.com/step-by-step-guide-upgrading-postgresql-docker-containers/).
