More sensible header structure. Cute cow at the bottom

markdown/2016-04-02-apt-caching-for-debootstrap.md

@@ -5,16 +5,16 @@
 
 If you’re building system images, you’re going to do a lot of debootstrap, which is going to fetch a lot of packages. On a fast system, that’ll be the slowest part of the process. Here’s how to cache.
 
-### Install apt-cacher-ng
+## Install apt-cacher-ng
 
     sudo apt-get install squid-deb-proxy
 
-### Tell programs to use the proxy
+## Tell programs to use the proxy
 
     export http_proxy=http://127.0.0.1:8000
     # Note that you'll need to re-export this before any use of debootstrap
 
-### Tell sudo to pass through http\_proxy
+## Tell sudo to pass through http\_proxy
 
     sudo visudo
     # Add the line after the env_reset line: