Currently, the lexical version diff component is completely unstyled, as the scss was never included in our css bundle. This PR ensures that the diff component scss is included in our css bundle
This replaces our JSON-based richtext diffing with HTML-based richtext diffing for lexical. It uses [this HTML diff library](https://github.com/Arman19941113/html-diff) that I then modified to handle diffing more complex elements like links, uploads and relationships. This makes it way easier to spot changes, replacing the lengthy Lexical JSON with a clean visual diff that shows exactly what's different. ## Before  ## After  