fix(rss): add cdata to escape html content for rss feed (#2046)

Abhi

2025-07-14 059848f8b0ae36e3a8fb4bd6fd3cda8531e5dce7

 quartz/components/styles/readermode.scss

@@ -15,6 +15,7 @@
    width: 20px;
    height: 20px;
    top: calc(50% - 10px);
    fill: var(--darkgray);
    stroke: var(--darkgray);
    transition: opacity 0.1s ease;
  }