posts: add diagram for shared Guix profiles and store
drwxr-xr-x - css
drwxr-xr-x - downies
-rw-r--r-- 1150 favicon.ico
drwxr-xr-x - images
drwxr-xr-x - js
drwxr-xr-x - posts
-rw-r--r-- 1727 rekado.pubkey
-rw-r--r-- 6307 site.hs
drwxr-xr-x - static
drwxr-xr-x - templates