fix(validate-sidebar): add to pre-commit hook

.husky/pre-commit

@@ -10,11 +10,13 @@ npm test
 if command -v rg >/dev/null 2>&1; then
   if git diff --cached --name-only | rg -q '^docs/'; then
     npm run docs:validate-links
+		npm run docs:validate-sidebar
 		npm run docs:build
   fi
 else
   if git diff --cached --name-only | grep -Eq '^docs/'; then
     npm run docs:validate-links
+		npm run docs:validate-sidebar
 		npm run docs:build
   fi
 fi