Fix GitBook build: Update Node.js version from 18 to 14 (#4)

* Initial plan

* Fix GitBook build: Update Node.js version from 18 to 14

Co-authored-by: sundevilyang <1499214+sundevilyang@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sundevilyang <1499214+sundevilyang@users.noreply.github.com>

Author: Copilot

.github/workflows/gitbook.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "18"
+          node-version: "14"
           cache: "npm"
 
       - name: Install dependencies