chore: add sponsor link

Author: lukasbach

packages/demo/index.html

@@ -34,6 +34,14 @@ <h1>monaco-editor-auto-typings</h1>
             aria-label="Issue lukasbach/monaco-editor-auto-typings on GitHub"
             >Issue</a
           >
+          <a
+            class="github-button"
+            href="https://github.com/sponsors/lukasbach"
+            data-icon="octicon-heart"
+            data-size="large"
+            aria-label="Sponsor @lukasbach on GitHub"
+            >Sponsor</a
+          >
           <a
             class="github-button"
             href="https://github.com/lukasbach"