Optimize our Bundle Size

[zusorio]

Our main bundle size is currently around 7MB. This is very large and can lead to slow loading times (both due to network and parsing js). We should work to significantly decrease its size. Here's a collection of things that should be done

• Load Monaco on demand: Monaco is by far the largest part of our bundle. There's a library called ngx-monaco-editor-v2 that loads Monaco on demand, when we actually need it.
• Replace highlight.js with shiki: This has already been done in feat: Move from highlight.js to shiki #2122 and reduced the bundle by 1MB while yielding better results
• Add bundle size monitoring #2125
• Serve files using gzip #2126