[Front] Styles for basic pages.

[jlbellido]

We need to review the basic pages from the front-end side.

How to reproduce:

• Create a node of type basic page.
• Provide a title and a sample body text.
• Check the styles.

[rafavermo]

I'm working in this task but I have no permissions to assign me. @jlbellido

[jlbellido]

I think it's fine for a first iteration, we'll review this again once the designs are finished. Thanks for your work here @rafavermo !

[jlbellido]

We'll work in a separate issue to adapt the basic pages to the final design.