add apache rewrite rule to ansible for migrated media

[rlskoeser]

I think the apache rewrite rule we want should be something like this:

RewriteEngine On
RewriteCond "%{REQUEST_URI}"  "^/media/uploads" 
RewriteRule "/(.*\.(jpg|jpeg|gif|png))$" "/media/original_images/$1" [L,R=301]

It's not working in an online regex tester but I'm not sure why, and this is pretty close to some of the examples in the apache documentation, so hopefully it will work with a little testing and tweaking.

@thatbudakguy how/where should we track adding this to our deploy apache conf? We can't add it yet or because will break cdhweb 2.8.1.

Originally posted by @rlskoeser in #248 (comment)

[thatbudakguy]

confirmed working by testing two different images at their old URLs, which successfully redirected with a 301 (embedded in blogpost and featured on project page).