docs: Update and extend links to distribution packages

This patch updates and extends the links to the distribution packages,
referencing them from the README (it's more likely to be what the reader
wants to see), and also extending the Arch packaging with binary package
information.

README.md

@@ -40,8 +40,8 @@ It's written in [Go](https://golang.org), and distributed under the
     * [SPF] and [MTA-STS] checking.
 
 
-[Arch]: https://www.archlinux.org/
-[Debian]: https://debian.org
+[Arch]: https://blitiri.com.ar/p/chasquid/install/#arch
+[Debian]: https://blitiri.com.ar/p/chasquid/install/#debianubuntu
 [Dovecot]: https://blitiri.com.ar/p/chasquid/dovecot/
 [Hooks]: https://blitiri.com.ar/p/chasquid/hooks/
 [IDNA]: https://en.wikipedia.org/wiki/Internationalized_domain_name
@@ -51,7 +51,7 @@ It's written in [Go](https://golang.org), and distributed under the
 [SMTPUTF8]: https://en.wikipedia.org/wiki/Extended_SMTP#SMTPUTF8
 [SPF]: https://en.wikipedia.org/wiki/Sender_Policy_Framework
 [Tracking]: https://blitiri.com.ar/p/chasquid/sec-levels/
-[Ubuntu]: https://ubuntu.com
+[Ubuntu]: https://blitiri.com.ar/p/chasquid/install/#debianubuntu
 
 
 ## Documentation

docs/install.md

@@ -5,7 +5,9 @@
 
 ### Debian/Ubuntu
 
-If you're using Debian or Ubuntu, chasquid can be installed by running:
+If you're using [Debian](https://packages.debian.org/chasquid) or
+[Ubuntu](https://packages.ubuntu.com/chasquid), chasquid can be installed by
+running:
 
 ```shell
 sudo apt install chasquid
@@ -24,6 +26,10 @@ how to install it.  If you use the [pacaur](https://github.com/E5ten/pacaur)
 pacaur -S chasquid
 ```
 
+[Binary packages](https://foxcpp.dev/archlinux/README.txt) are also available,
+courtesy of foxcpp.
+
+
 ### From source
 
 To get, build and install from source, you will need a working