Replace sign up and terms illustrations with SVG

remove app/assets/images/confirm-illustration.png

confirm illustration

align illustrations

minimize illustrations

Add original design files in assets

app/assets/stylesheets/common.scss

@@ -713,7 +713,7 @@ tr.turn {
 /* Overrides for pages that use new layout conventions */
 
 .header-illustration {
-  background-position: 0 0;
+  background-position: right;
   background-repeat: no-repeat;
   position: relative;
   min-height: 200px;
@@ -722,16 +722,15 @@ tr.turn {
   bottom: 0;
 
   &.new-user-main {
-    background-image: image-url("sign-up-illustration.png");
-    background-position-x: 50px;
+    background-image: image-url("sign-up-illustration.svg");
   }
 
   &.confirm-main {
-    background-image: image-url("confirm-illustration.png");
+    background-image: image-url("confirm-illustration.svg");
   }
 
   &.new-user-terms {
-    background-image: image-url("terms-illustration.png");
+    background-image: image-url("terms-illustration.svg");
   }
 }