Add some DTTH notice

src/pages/welcome.jsx

@@ -104,6 +104,7 @@ function Welcome() {
           </a>
           .
         </p>
+        <p class="desc">A minimalistic opinionated DTTHDon web client.</p>
       </div>
       <div id="why-container">
         <div class="sections">
@@ -162,6 +163,38 @@ function Welcome() {
           </section>
         </div>
       </div>
+      <footer>
+        <hr />
+        <p>
+          <a href="https://git.dtth.ch/nki/phanpy" target="_blank">
+            DTTHDon Fork
+          </a>
+        </p>
+        <p>
+          <a href="https://github.com/cheeaun/phanpy" target="_blank">
+            Original built
+          </a>{' '}
+          by{' '}
+          <a
+            href="https://mastodon.social/@cheeaun"
+            target="_blank"
+            onClick={(e) => {
+              e.preventDefault();
+              states.showAccount = 'cheeaun@mastodon.social';
+            }}
+          >
+            @cheeaun
+          </a>
+          .{' '}
+          <a
+            href="https://github.com/cheeaun/phanpy/blob/main/PRIVACY.MD"
+            target="_blank"
+          >
+            Privacy Policy
+          </a>
+          .
+        </p>
+      </footer>
     </main>
   );
 }