Use PageTransition component on every route

- Scrolls back to top when mounting new page with a timeout of the delay
- Rename photo Viewer class
- Change Shop posters section text from p to label

src/style/style.scss

@@ -26,6 +26,7 @@
 @import "pages/credits";
 @import "pages/subscribe";
 @import "pages/location";
+@import "pages/viewer";
 @import "pages/shop";
 
 // Modules
@@ -70,9 +71,5 @@
 // Layouts
 @import "layouts/poster";
 
-
-// Pages
-@import "pages/viewer-photo";
-
 // Misc
 @import "animations";