Next steps for the webpack docs

[jtoar]

Having just merged #574, here's some thoughts on the next steps we could take for the webpack docs:

• More advanced examples
  • If you're configuring webpack, it's probably not for a simple reason. But right now most of the examples we have are simple, so it'd be nice to have a more advanced one.
    • Note that a more advanced example probably should be a cookbook.
• Webpack Bundle Analyzer
  • We make this available via yarn rw build --stats, but I haven't seen anyone use it. It seems super useful; definitely more of a late game thing, but a cookbook on this would be great.
  • Link to the PR: Add bundle analyzer commands redwood#120
• More coverage
  • We could always just increase the resolution; we don't want the doc to become unusable though. But I don't think we're risking that at all yet.
• Replace index-search with utility function https://github.com/redwoodjs/redwoodjs.com/issues/182