Fix https
Note that the following config entries were removed url_base, site_url and server_https. They are replaced by url_hostname and url_protocol. The names of the two hopefully speak for themselves and give an idea about how they are used.
# if you have a tls reverse proxy before dq-dev
# enter your hostname below and set 'url_protocol' to 'https'
url_hostname = "localhost"
url_protocol = "http"
You can also always have a look into the baseconf.toml to find out what a complete configuration file looks like.
Testing Https
If you want to test https locally you can check out the folder test/dqdev-rp. There is a docker setup that spins up a TLS using reverse proxy for testing purposes. The readme file in the folder and the configuration may also help you to get an idea how https is used.