Add a newsletter subscription form below locations

- One component used below Locations list and in the Pagination when all photos has been loaded
- Keep the subscribe page with the column display

src/style/_variables.scss

@@ -1,5 +1,6 @@
 // Colors
 $color-primary: #3C0576;
+$color-primary-dark: #36046A;
 $color-primary-darker: #2D0458;
 $color-secondary: #FF6C89;
 $color-secondary-light: #FFB3C2;