a11y(darkmode): use a button for the theme toggle (#1335)

Andrew

2024-08-24 4c9e8601504f76dcc3c273ea8ad1862df432b7b4

 quartz.layout.ts

@@ -5,6 +5,7 @@
export const sharedPageComponents: SharedLayout = {
  head: Component.Head(),
  header: [],
  afterBody: [],
  footer: Component.Footer({
    links: {
      GitHub: "https://github.com/jackyzha0/quartz",