chore(docs): single preview comment

.github/workflows/preview-docs.yml

@@ -6,6 +6,7 @@ on:
       - main
     paths: 
       - 'fern/**'
+      - 'packages/cli/docs-*'
   workflow_dispatch:
     inputs:
       prNumber:
@@ -42,8 +43,24 @@ jobs:
           echo "Preview URL: $URL"
           echo "🌿 Preview your docs: $URL" > preview_url.txt
 
-      - name: Comment URL in PR
-        uses: thollander/actions-comment-pull-request@v2.4.3
-        with:
-          filePath: preview_url.txt
-          comment_tag: docs-preview-link
+      - name: Comment or Update URL in PR
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          COMMENT_TAG="<!-- docs-preview-link -->"
+          PREVIEW_URL=$(cat preview_url.txt)
+
+          # Get existing comments
+          EXISTING_COMMENT=$(gh api repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments \
+            --jq ".[] | select(.body | contains(\"${COMMENT_TAG}\")) | .id")
+
+          if [ -z "$EXISTING_COMMENT" ]; then
+            # No existing comment, create one
+            gh api repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments \
+              -f body="${COMMENT_TAG}\n🌿 Preview your docs: $PREVIEW_URL"
+          else
+            # Update existing comment
+            gh api repos/${{ github.repository }}/issues/comments/$EXISTING_COMMENT \
+              -X PATCH \
+              -f body="${COMMENT_TAG}\n🌿 Preview your docs: $PREVIEW_URL"
+          fi

fern/pages/docs/building-your-docs/announcement-banner.mdx

@@ -12,3 +12,5 @@ announcement:
 ```
 
 Markdown and HTML is supported in the announcement message. You can include links, images, and other formatting. [Custom css](/learn/docs/building-your-docs/custom-css-global-js#custom-css) can be used to customize the style of the announcement.
+
+Another docs change