fix: generalize frontmatter parsing and coercing

Jacky Zhao

2024-01-28 42ee069c1cc515e6c5e595143e46c8201c6cbe3f

 quartz/styles/callouts.scss

@@ -13,7 +13,7 @@
    margin-top: 0;
  }

  &[data-callout="note"] {
  &[data-callout] {
    --color: #448aff;
    --border: #448aff44;
    --bg: #448aff10;