add package mirror page

_data/navigation.yml

@@ -1,6 +1,6 @@
 - name: Home
   link: /
-- name: Packages
+- name: Repos
   link: /pkg/
 - name: About
   link: /about/

pkg.md

@@ -10,6 +10,8 @@ I maintain a public mirror of selected software repositories which is free to
 use for everyone.  The available bandwidth is "some", and you are guaranteed a
 yearly average uptime of at least "probably".
 
+Please contact <webmaster@fef.moe> for anything related to mirrors.
+
 ## Arch Linux
 
 Official Arch Linux packages and ISOs for x86.  <https://archlinux.org>