Add customisation variables

sass/components/media.sass

@@ -1,21 +1,3 @@
-.media-left,
-.media-right
-  flex-basis: auto
-  flex-grow: 0
-  flex-shrink: 0
-
-.media-left
-  margin-right: 1rem
-
-.media-right
-  margin-left: 1rem
-
-.media-content
-  flex-basis: auto
-  flex-grow: 1
-  flex-shrink: 1
-  text-align: left
-
 .media
   align-items: flex-start
   display: flex
@@ -42,3 +24,21 @@
     & + .media
       margin-top: 1.5rem
       padding-top: 1.5rem
+
+.media-left,
+.media-right
+  flex-basis: auto
+  flex-grow: 0
+  flex-shrink: 0
+
+.media-left
+  margin-right: 1rem
+
+.media-right
+  margin-left: 1rem
+
+.media-content
+  flex-basis: auto
+  flex-grow: 1
+  flex-shrink: 1
+  text-align: left