Upstream updates

[dwwoelfel]

• Fix bug with CORs warning
  • Previously it might go off if the user lost their internet connection
• Better highlighting
  • Uses the same highlighting that VSCode uses
  • You can choose any theme from https://sourcecodeshots.com/docs/supported-themes, just set the NEXT_PUBLIC_CODE_THEME env var to the id value of the theme
• Better google analytics integration
• Improved og:description
  • Converts the markdown into plain text so that you get "Hello world" instead of "Hello world"- Better scroll handling
  • Readers won't lose their place they scrolls down the home page, click on an essay, then go back
• Adds a Sitemap
• Pulls og:image from sourcecodeshots.com and uses your default code theme

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[stopachka]

Great work brother!