Fix HTML front

Author: engboris

web/index.html

@@ -179,6 +179,8 @@ <h1>Stellogen Playground</h1>
             <option value="macros">Macro System</option>
             <option value="nat">Natural Numbers</option>
             <option value="automata">Finite Automata</option>
+            <option value="stackmachine">Stack Machine (NPDA)</option>
+            <option value="turing">Turing Machine</option>
             <option value="stack">Stack Operations</option>
         </select>
         <button id="clearBtn">Clear</button>