This removes an unused letsencrypt dir bind mount for jitsi-meet web
that was causing confusion (we run letsencrypt out of band and put the
certs in the correct dir so we don't need this specific bind mount).
We also remove the now unused config.js config file from the role.
We stop managing the default nginx config and instead rely on the
container provided template. To properly configure http redirects we
set the ENABLE_HTTP_REDIRECT flag in the env var file.
Finally we update the README file with a bit more info on how this all