docs(site): note fn+F2 on mac

docs/_layouts/default.html

@@ -51,15 +51,15 @@
           </div>
 
           <div class="titlebar__actions">
-            <button
+	            <button
-              class="theme-toggle"
+	              class="theme-toggle"
-              type="button"
+	              type="button"
-              data-theme-toggle
+	              data-theme-toggle
-              aria-label="Toggle theme (F2)"
+	              aria-label="Toggle theme (F2; on Mac: fn+F2)"
-              aria-pressed="false"
+	              aria-pressed="false"
-            >
+	            >
-              <span class="theme-toggle__key">F2</span>
+	              <span class="theme-toggle__key">F2</span>
-              <span class="theme-toggle__label" data-theme-label>theme</span>
+	              <span class="theme-toggle__label" data-theme-label>theme</span>
             </button>
           </div>
         </div>
@@ -123,12 +123,13 @@
             <a href="https://github.com/steipete/clawdis">source</a>
             <span class="footer__sep">·</span>
             <a href="https://www.npmjs.com/package/clawdis">npm</a>
-          </div>
+	          </div>
-          <div class="footer__hint" aria-hidden="true">
+	          <div class="footer__hint" aria-hidden="true">
-            tip: press <kbd>F2</kbd> to flip the universe
+	            tip: press <kbd>F2</kbd> (Mac: <kbd>fn</kbd>+<kbd>F2</kbd>) to flip
-          </div>
+	            the universe
-        </footer>
+	          </div>
-      </div>
+	        </footer>
-    </main>
+	      </div>
-  </body>
+	    </main>
+	  </body>
 </html>