Add simple sample posts, JSON retrieval & basic display of post

I heard you liked displaying posts so I displayed some posts in your post display.

Right now, if you change any of the fields in the input, it queries the blog posts, but since the Entry model doesn't have queryable parameters yet, it just grabs all of them.

Also, I added a way to add sample posts. There are only a few and we'll have to give them queryable fields when we do so with the Entry model.