build(deps): docusaurus 3.6.3 + faster

[erickzhao]

Upgrades to latest Docusaurus and swaps out the underlying build toolchain.

• Installs @docusaurus/faster, which is an experimental opt-in change that swaps webpack for rspack amongst other tooling changes.
• Removes esbuild-loader, which we were using to run esbuild bundling via webpack.

Anecdotally, cold builds seem to have gone from 60s long to 30s long on my M1 Max MacBook.

[cloudflare-workers-and-pages]

Deploying electron-website with    Cloudflare Pages

Latest commit:	d9058b6
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[dsanders11]

This looks interesting. Can we rebase this on main once #709 is merged? That's the only custom Webpack build step we have AFAIK. I know the Docusaurus blog post says most Webpack plugins should work with rspack, but might as well do that PR first since it ensures this is cleaner.

[erickzhao]

@dsanders11 Done. The other custom part that I removed here was using esbuild-loader instead of whatever the default would be for Docusaurus.