Try Docusaurus Faster

[rjbeers]

In Docusaurus 3.6, they added an rspack based build system. In 3.8, they added persistent caching. This should now be much faster and is likely to replace the webpack based build system. https://docusaurus.io/blog/releases/3.8#docusaurus-faster

We should try enabling this and see if we have any issues.

[nickytonline]

Will run this again tomorrow when my Copilot premium credits kick back in.