docs: remove out of date admonition (#2114)

Lumen Yang

2025-09-05 a4028289aae22f2a073b2837c3a85d9fc4a86087

 quartz/components/styles/footer.scss

@@ -1,6 +1,8 @@
footer {
  text-align: left;
  opacity: 0.8;
  margin-bottom: 4rem;
  opacity: 0.7;

  & ul {
    list-style: none;
    margin: 0;