- created pills for 2 authors and 3+ authors;
- moved Author pills to a single file located in Authors/AuthorPills;
- fixed imports

- make header correspond to page type, changing background and font
  colors based on the type of page it is inserted instead of being
  generic

- changed metadata generation, badges, favicons and open graphs,
  replacing payload boilerplate open graph and use content tailored to
  the content-sub project

- remake author pill as a standalone component;
- use conditional rendering to make it fit one, two or more
contributors;