We are being explicit about which railties we want to require in our
application. This for be able to deploy our application succesfully.

We have noticed how the body of the posts is not being rendered
correctly.

I have found that the `find_and_preserve` method is the one causing
the issue. If we move it, the body of the posts will be rendered
correctly.

The extension of the asset is required; otherwise, it won't be present
in the asset pipeline.