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/pages/_viewer.scss

@@ -1,4 +1,4 @@
-.viewer-photo {
+.viewer {
     position: relative;
     height: 100vh;
     display: flex;
@@ -424,7 +424,7 @@
 
     // Close button
     &__close {
-        position: fixed;
+        position: fixed !important;
         z-index: 2;
         top: 16px;
         right: calc(16px + 44px + 12px);

src/style/pages/shop/_posters.scss

@@ -108,7 +108,8 @@
             text-align: left;
         }
 
-        p {
+        &__text {
+            display: block;
             font-size: rem(18px);
             color: $color-cream;
             font-weight: 300;