This commit introduces the automatic retrieval of TLS certificates from Let's Encrypt. If the feature is enabled, Vikunja will automagically request a certificate from Let's Encrypt and configure it to server content via TLS.
This change introduces a more abstract way of managing the config, allowing us to generate it into yaml and markdoc for the website.
It also changes the distributed config to be all commented out so that people using it only comment in the values they need.
