Turn README.Debian into a markdown file

It is common to have a markdown file per deployment subdirectory.
Still install it as `README.Debian` to `/usr/share/doc/matrix-conduit`
as per Debian policy.

Also update the link in the main `README.md` file.

Cargo.toml

@@ -137,7 +137,7 @@ instead of a server that has high scalability."""
 section = "net"
 priority = "optional"
 assets = [
-  ["debian/README.Debian", "usr/share/doc/matrix-conduit/", "644"],
+  ["debian/README.md", "usr/share/doc/matrix-conduit/README.Debian", "644"],
   ["README.md", "usr/share/doc/matrix-conduit/", "644"],
   ["target/release/conduit", "usr/sbin/matrix-conduit", "755"],
 ]

README.md

@@ -39,7 +39,7 @@ Check out the [Conduit 1.0 Release Milestone](https://gitlab.com/famedly/conduit
 #### How can I deploy my own?
 
 - Simple install (this was tested the most): [DEPLOY.md](DEPLOY.md)
-- Debian package: [debian/README.Debian](debian/README.Debian)
+- Debian package: [debian/README.md](debian/README.md)
 - Nix/NixOS: [nix/README.md](nix/README.md)
 - Docker: [docker/README.md](docker/README.md)
 

debian/README.md

@@ -6,23 +6,23 @@ Configuration
 
 When installed, Debconf generates the configuration of the homeserver
 (host)name, the address and port it listens on. This configuration ends up in
-/etc/matrix-conduit/conduit.toml.
+`/etc/matrix-conduit/conduit.toml`.
 
 You can tweak more detailed settings by uncommenting and setting the variables
-in /etc/matrix-conduit/conduit.toml. This involves settings such as the maximum
+in `/etc/matrix-conduit/conduit.toml`. This involves settings such as the maximum
 file size for download/upload, enabling federation, etc.
 
 Running
 -------
 
-The package uses the matrix-conduit.service systemd unit file to start and
+The package uses the `matrix-conduit.service` systemd unit file to start and
 stop Conduit. It loads the configuration file mentioned above to set up the
 environment before running the server.
 
 This package assumes by default that Conduit will be placed behind a reverse
 proxy such as Apache or nginx. 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.
+on `127.0.0.1` and the free port `6167` and is reachable via a client using the URL
+<http://localhost:6167>.
 
 At a later stage this packaging may support also setting up TLS and running
 stand-alone.  In this case, however, you need to set up some certificates and