Base: Add page for testing styling on display: inline elements

Author: https://github.com/AtkinsSJ
Commit: 14dc20118c
Pull-request: https://github.com/SerenityOS/serenity/pull/10146

Base/res/html/misc/welcome.html

@@ -123,6 +123,7 @@
             <li><a href="percent-css.html">Percentage values</a></li>
             <li><a href="position-absolute-top-left.html">position: absolute; for top and left</a></li>
             <li><a href="cascade-keywords.html">Cascade keywords (initial, inherit, unset)</a></li>
+            <li><a href="inline-node.html">Styling "inline" elements</a></li>
         </ul>
 
         <h2>JavaScript/Wasm</h2>