Add copyright note

Closes #1103

app/components/layout/Footer.tsx

@@ -18,6 +18,8 @@ import { PatreonIcon } from "../icons/Patreon";
 import { TwitterIcon } from "../icons/Twitter";
 import { Image } from "../Image";
 
+const currentYear = new Date().getFullYear();
+
 export function Footer({
   patrons = [],
 }: {
@@ -98,6 +100,12 @@ export function Footer({
           </ul>
         </div>
       ) : null}
+      <div className="layout__copyright-note">
+        sendou.ink © Copyright of Sendou and contributors 2019-{currentYear}.
+        Original content & source code is licensed under the GPL-3.0 license.
+        Splatoon is trademark & © of Nintendo 2014-{currentYear}. Sendou.ink is
+        not affiliated with Nintendo.
+      </div>
     </footer>
   );
 }

app/styles/layout.css

@@ -323,6 +323,12 @@
   margin-block-start: var(--s-2);
 }
 
+.layout__copyright-note {
+  color: var(--text-lighter);
+  font-size: var(--fonts-xxs);
+  text-align: center;
+}
+
 @media screen and (max-width: 640px) {
   .layout__header {
     --item-size: 2.5rem;