chore: remove husky and lint-staged (#4232)

Husky forces git pre-commit hooks for all contributors, which can
block commits when npm isn't in the system path. CI already handles
linting on push. lint-staged was only invoked by the husky hook and
had no standalone script.

Ref: openedx/frontend-app-learning#1622

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: brian-smith-tcril

.husky/pre-commit

@@ -200,8 +200,6 @@ Paragon provides a comprehensive set of npm scripts to help with development, te
 
 - **`npm run prepublishOnly`** - Automatically runs before npm publish to ensure the library is built before distribution.
 
-- **`npm run prepare`** - Sets up Git hooks (via Husky) for pre-commit linting and other checks.
-
 ## Contributing
 
 The branch to target with your PR depends on the type of change you are contributing to Paragon.