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

Zane Helton

2023-08-23 632c27b7ec133d15d890eb28c98eb9716ca01407

 quartz/styles/base.scss

@@ -320,7 +320,6 @@
  border-radius: 5px;
  overflow-x: auto;
  border: 1px solid var(--lightgray);
  position: relative;

  &:has(> code.mermaid) {
    border: none;