Caching of resources that are not rehashed across UI changes

Originally posted by @mrvisser on Hilary
```
There are some endpoints that end up being cached whose URL doesn't change when their contents do. Some examples:

/user/*
/group/*
/content/*
/
/creategroup
etc...

I think it would be safe to say that any endpoint that doesn't explicitly have a caching set for them in Nginx that they shouldn't be cached. There must be something that is causing Nginx to cache them by default.
```