Added FastRender support

Hi,

I've added fastRender support. There was a problem with the FastRender too. It didn't handle routes define by packages (like this). Now it has been fixed.

## Here are the changes

* I've added a new publication called `singlePost` which publish only a single post
* It will be used in `/blog/:slug` route

## Suggestion

* In the `/blog` route, don't get the body filter it out
* create the excerpt in the server when creating the post and add it to a field.