Let's use Haml instead of Erb.
Added the cover partial which shows a photo above the navigation.
Added the menu partial which renders the cover partial as well.
Added the footer partial which adds the copyright notice.
Added the header partial which adds the title and subtitle of the website.
Added the already created partials to the application layout.
Removed the application.css file and added an application.css.sass file with a lot of Sass partials. In other words, added styling to the website.
Removed Turbolinks.
Added Kuva.
Overwritten the Kuva views.
Overwritten the Kuva default styles.