Address Netlify's deprecation of asset optimization

[cjcenizal]

Per https://answers.netlify.com/t/please-read-deprecation-of-post-processing-asset-optimization/96657 Netlify is EOLing asset optimization on Oct 17:

After this date, Netlify will still build and serve your site but users might experience slower load times as they'll need to download more and/or bigger files.

I need to review the impact on the docs site and implement optimization of the affected assets in our build process.

[eskibars]

We only minimally (pardon the pun) use Netlify's asset optimization. It's only enabled for CSS today, which gets bundled+minified. We could pre-bundle/pre-minify but I don't think it's going to make a huge difference