Remove custom link validation script, keep only lychee-action

Removed custom validation tooling as requested:
- Deleted scripts/validate-docs-links.mjs
- Deleted scripts/README.md
- Deleted .github/workflows/validate-docs-links.yml
- Removed validate:links npm script from package.json
- Updated CONTRIBUTING.md to reference only lychee-action

Keeping only the lychee-action workflow (.github/workflows/check-links.yml)
for link validation.

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

.github/workflows/validate-docs-links.yml

@@ -453,19 +453,7 @@ Fumadocs is configured with `baseUrl: '/docs'`, which means all documentation pa
 
 #### Validating Links
 
-Before submitting documentation changes, validate all internal links:
-
-```bash
-# Validate all documentation links
-pnpm validate:links
-```
-
-This will check:
-- Links point to existing files and routes
-- Links use correct path structure with /docs/ prefix
-- Suggestions for fixing common issues
-
-The validation runs automatically on PRs that modify documentation files.
+Link validation runs automatically via GitHub Actions on all PRs using lychee-action. This checks for broken internal and external links.
 
 See [Documentation Guide](./docs/README.md) for details.
 

CONTRIBUTING.md

@@ -30,7 +30,6 @@
     "test:ui": "vitest --ui",
     "test:coverage": "vitest run --coverage",
     "lint": "pnpm -r lint",
-    "validate:links": "node scripts/validate-docs-links.mjs",
     "cli": "node packages/cli/dist/cli.js",
     "objectui": "node packages/cli/dist/cli.js",
     "doctor": "node packages/cli/dist/cli.js doctor",