This adds a feature where you can enable users to only find members of teams they're part of. This makes the user search when sharing projects less confusing, because users only see other users they already know.
It is still possible to add users to teams with their email address, if they have that enabled in the user settings.
This allows to configure the used bcrypt rounds and set it to 4 in tests, greatly speeding up the tests. It's not really required to set this to another value but it might be in the future as computers get faster.
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.
