refactor: lint challenges as part of curriculum, not root (#65665)

Co-authored-by: Mrugesh Mohapatra <1884376+raisedadead@users.noreply.github.com>

package.json

@@ -48,7 +48,6 @@
     "knip:all": "npx -y knip@5 ",
     "lint-root": "pnpm npm-run-all lint:*",
     "lint": "turbo type-check && turbo lint && turbo lint-root",
-    "lint:challenges": "cd ./curriculum && pnpm run lint-challenges",
     "lint:prettier": "prettier --list-different .",
     "lint:css": "stylelint '**/*.css'",
     "preseed": "turbo setup",
@@ -92,10 +91,8 @@
     "js-yaml": "3.14.1",
     "lint-staged": "^16.2.7",
     "lodash": "4.17.21",
-    "markdownlint": "0.33.0",
     "npm-run-all2": "5.0.2",
     "prettier": "3.2.5",
-    "prismjs": "1.29.0",
     "stylelint": "16.14.1",
     "tsx": "4.19.1",
     "turbo": "^2.8.1",