- Precompute step counts per entry path (using default scenario) at
  build time and show them in the route badge on entry path cards
- Precompute step counts for all journey+scenario combinations at build
  time and embed in the manifest JSON
- Add a `data-workshop-step-count` route badge to scenario cards
- In the client-side render() loop, populate scenario card step counts
  dynamically based on the currently selected journey, so users see the
  exact step count for each scenario before they select it
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

…th CSS
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>