about page : use slightly more space (#2791)

app/javascript/styles/about.scss

@@ -7,7 +7,7 @@
     padding-bottom: 50px;
 
     &.thicc {
-      max-width: 700px;
+      max-width: 800px;
     }
   }
 
@@ -228,7 +228,7 @@
 
   .sidebar {
     border-left: 1px solid lighten($color1, 10%);
-    width: 180px;
+    width: 200px;
     flex: 0 0 auto;
   }