debian: make the docs actually coherent and understandable, and update it

the language here is very poor and i'm not sure why it was written like this.

Signed-off-by: strawberry <strawberry@puppygock.gay>

debian/README.md

 # conduwuit for Debian
 
-Installation
-------------
+Information about downloading and deploying the Debian package. This may also be referenced for other `apt`-based distros such as Ubuntu.
 
-Information about downloading, building and deploying the Debian package, see
-the "Installing conduwuit" section in the Deploying docs.
-All following sections until "Setting up the Reverse Proxy" be ignored because
-this is handled automatically by the packaging.
+### Installation
 
-Configuration
--------------
+It is recommended to see the [generic deployment guide](../deploying/generic.md) for further information if needed as usage of the Debian package is generally related.
 
-When installed, Debconf generates the configuration of the homeserver
-(host)name, the address and port it listens on. This configuration ends up in
-`/etc/conduwuit/conduwuit.toml`.
+### Configuration
 
-You can tweak more detailed settings by uncommenting and setting the variables
-in `/etc/conduwuit/conduwuit.toml`. This involves settings such as the maximum
-file size for download/upload, enabling federation, etc.
+When installed, the example config is placed at `/etc/conduwuit/conduwuit.toml` as the default config. At the minimum, you will need to change your `server_name` here.
 
-Running
--------
+You can tweak more detailed settings by uncommenting and setting the config options
+in `/etc/conduwuit/conduwuit.toml`.
 
-The package uses the [`conduwuit.service`](../configuration.md#example-systemd-unit-file) systemd unit file to start and
-stop conduwuit. It loads the configuration file mentioned above to set up the
-environment before running the server.
+### Running
 
-This package assumes by default that conduwuit will be placed behind a reverse
-proxy. This default deployment entails just listening
-on `127.0.0.1` and the free port `6167` and is reachable via a client using the URL
-<http://localhost:6167>. Matrix federation requires TLS, so you will need to set up
-some certificates and renewal, for it to work properly.
+The package uses the [`conduwuit.service`](../configuration.md#example-systemd-unit-file) systemd unit file to start and stop conduwuit. The binary is installed at `/usr/sbin/conduwuit`.
+
+This package assumes by default that conduwuit will be placed behind a reverse proxy. The default config options apply (listening on `localhost` and TCP port `6167`). Matrix federation requires a valid domain name and TLS, so you will need to set up TLS certificates and renewal for it to work properly if you intend to federate.
+
+Consult various online documentation and guides on setting up a reverse proxy and TLS. Caddy is documented at the [generic deployment guide](../deploying/generic.md#setting-up-the-reverse-proxy) as it's the easiest and most user friendly.