Kelp GUI: add scrolling to welcome screen

Author: nikhilsaraf

gui/web/src/components/molecules/Welcome/Welcome.module.scss

@@ -42,6 +42,7 @@
     position: relative;
     border-radius: 4px;
     overflow: hidden;
+    max-height: 80%;
     z-index: 1;
     width: 90%;
     max-width: 700/16+rem;
@@ -66,6 +67,8 @@
 
 .content {
     width: 57%;
+    overflow-x: auto;
+    overflow-y: auto;
     padding: 2rem;
     box-sizing: border-box;
 }