feat(openchallenges): create a fresh project for the app using tailwind css

[rrchai]

Changelogs

• add tailwind VSCodes extension
• create a fresh project to migrate page(s) using tailwind css from openchallenges-app

nx g @nx/angular:application openchallenges-app-tailwind \
  --directory apps/openchallenges/app-tailwind \
  --bundler esbuild \
  --addTailwind \
  --e2eTestRunner none \
  --ssr \
  --projectNameAndRootFormat as-provided \
  --dry-run