docs: add smartlook token to docs build (#538)

Smartlook token for docs build

.github/workflows/docs.yaml

@@ -54,6 +54,8 @@ jobs:
             -   name: Build Docusaurus docs
                 run: npm run build
                 working-directory: ./website
+                env:
+                    SMARTLOOK_PROJECT_KEY: ${{ secrets.SMARTLOOK_DOCS_PROJECT_KEY }}
 
             -   name: Set up GitHub Pages
                 uses: actions/configure-pages@v4