docs: update `hosting.md` with Vercel hosting instructions (#406)

Zane Helton

2023-08-23 632c27b7ec133d15d890eb28c98eb9716ca01407

 quartz/components/styles/darkmode.scss

@@ -2,7 +2,7 @@
  position: relative;
  width: 20px;
  height: 20px;
  margin: 1rem;
  margin: 0 10px;

  & > .toggle {
    display: none;