Nav supports EXAMPLE_USERNAME (part of code only, rest in server/views/index.js)

client/components/Nav.jsx

@@ -351,7 +351,7 @@ class Nav extends React.PureComponent {
             { getConfig('EXAMPLES_ENABLED') &&
             <li className="nav__dropdown-item">
               <Link
-                to="/p5/sketches"
+                to={`/${getConfig('EXAMPLE_USERNAME')}/sketches`}
                 onFocus={this.handleFocusForFile}
                 onBlur={this.handleBlur}
                 onClick={this.setDropdownForNone}