fix(ci): Drop site/index.md from sync-about workflow (#55)

site/ is local-only (listed in .git/info/exclude), so the sed call in
the Patch step aborted the workflow on every push to main with
"sed: can't read site/index.md: No such file or directory". That kept
the README counter from being committed and skipped the wiki sync.

Patches README only now. site/ stays out of CI until the marketing
site is promoted.

.github/workflows/sync-about.yml

@@ -41,24 +41,24 @@ jobs:
             echo "About updated."
           fi
 
-      - name: Patch README + site counters
+      - name: Patch README counter
         if: github.event_name != 'pull_request'
         id: patch
         run: |
           n="${{ steps.count.outputs.count }}"
-          sed -i -E "s/[0-9]+ (streaming-first )?indicators/${n} \1indicators/g" README.md site/index.md
+          sed -i -E "s/[0-9]+ (streaming-first )?indicators/${n} \1indicators/g" README.md
           if git diff --quiet; then
             echo "changed=false" >> "$GITHUB_OUTPUT"
           else
             echo "changed=true" >> "$GITHUB_OUTPUT"
           fi
 
-      - name: Commit & push README + site
+      - name: Commit & push README
         if: steps.patch.outputs.changed == 'true' && github.event_name != 'pull_request' && github.ref == 'refs/heads/main'
         run: |
           git config user.name "wickra-bot"
           git config user.email "wickra-bot@users.noreply.github.com"
-          git add README.md site/index.md
+          git add README.md
           git commit -m "chore: sync indicator count to ${{ steps.count.outputs.count }} [skip ci]"
           git push