Photo: Tweak reveal animations and fix horizontal scroll

- Photo number doesn't jumps anymore (now reveals based on photo not the number)
- Properly reveal title locations lines
- Optimize code

src/style/organisms/_photos.scss

@@ -53,15 +53,10 @@
     .photo {
         position: relative;
         z-index: 4;
-        margin-bottom: 88px;
-
-        @include breakpoint (sm) {
-            margin-bottom: 120px;
-        }
 
         // Last photo doesn't need spacing
         &:last-child {
-            margin-bottom: 0;
+            padding-bottom: 0;
         }
     }
 
@@ -79,6 +74,12 @@
 
         // Photo
         .photo {
+            padding-bottom: 80px;
+
+            @include breakpoint (sm) {
+                padding-bottom: 120px;
+            }
+
             // Even photos
             &:nth-child(even) {
                 @include breakpoint (sm) {