Clean-up old JWT related bits

A while back we removed JWT usage from our code. However, there are still pieces left we should clean up. E.g.:

./pyproject.toml:pyjwt = "*"
./poetry.lock:name = "pyjwt"
./poetry.lock:    {file = "PyJWT-2.8.0-py3-none-any.whl", hash = "sha256:59127c392cc44c2da5bb3192169a91f429924e17aff6534d70fdc02ab3e04320"},
./poetry.lock:    {file = "PyJWT-2.8.0.tar.gz", hash = "sha256:57e28d156e3d5c10088e0c68abb90bfac3df82b40a71bd0daa20c65ccd5c23de"},
./tor_weather/settings.py:# JWT Secret
./tor_weather/settings.py:# This is the secret for JWT's issued for user authorization on the portal.
./tor_weather/settings.py:JWT_SECRET = environ.get("JWT_SECRET")