Project-Timeline: Introduced timeline on projects

Limited to projects of category assets and film for now.

src/styles/_utils.sass

@@ -306,6 +306,12 @@
 	100%
 		transform: scale(1.0)
 
+@keyframes fade-in
+	0%
+		opacity: 0
+	100%
+		opacity: 1
+
 @keyframes grow-bounce-out
 	0
 		transform: scale(1.0)

src/styles/components/_placeholder.sass

@@ -0,0 +1,6 @@
+.placeholder
+    +pulse-75
+
+    &.replaced // added before replaced
+        opacity: 0
+        transition: 250ms 

src/styles/components/_timeline.sass

@@ -15,10 +15,17 @@
         margin-right: -15px
         margin-left: -15px
         padding-right: 15px
-    .sticky-top
-        top: 2.5rem
+    
+    .group
+        opacity: 0
+        animation: fade-in 500ms forwards
+
+body.homepage
+    .timeline
+        .sticky-top
+            top: 2.5rem
 
 body.is-mobile
         .timeline
             .js-asset-list
-                @extend .card-deck-vertical
+                @extend .card-deck-vertical