chore(deps): bump tailwindcss from 0.7.4 to 2.2.15 in /webapp

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss) from 0.7.4 to 2.2.15.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/master/CHANGELOG.md)
- [Commits](tailwindlabs/tailwindcss@v0.7.4...v2.2.15)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>