* [docs] Add a certificates guide in Advanced
This adds some documentation about the process of getting certificates
through ACME in general. It also provides a number of links to
alternative clients and certbot deployment guides that are up to date.
Slightly restructure the NGINX and Apache reverse proxy documentation
and insert mentions to the Provisioning TLS certificates advanced
documentation in them.
* [docs] Add firewall section in Advanced
* [docs] Add new guides to section indexes
* [docs] Fix spelling issue
* [docs] Fix a few typos
This tries to revamp/restructure the installation guide. It's renamed to
"Getting Started" as it now contains a few more things than just the
installation, especially the deployment considerations which we didn't
use to spell out as much ahead of time.
Installation is now a section with the guides on their own. I've removed
a bit of redundancy like the user creation. I also removed the rogue
reverse proxy section in the Docker guide and lifted that into the
reverse proxy section.
