fix: Disable 'dark reader' chrome extension on Outline.

- We have native dark mode
- With extension enabled it mutates the document causing unrecoverable render loops

closes #6353

server/static/index.html

@@ -8,6 +8,7 @@
     <meta name="color-scheme" content="light dark" />
     <meta name="apple-mobile-web-app-capable" content="yes" />
     <meta name="description" content="{description}" />
+    <meta name="darkreader-lock" />
     <link rel="manifest" href="/static/manifest.webmanifest" />
     <link rel="canonical" href="{canonical-url}" data-react-helmet="true" />
     {prefetch}