fix(ci): use working-directory instead of cd for Cloudflare deploy

Gitea/GitHub Actions auto-groups a multi-line run: script under
"Run <first line>". With `cd docs/site` as the first line, the
collapsed log tree showed that instead of the actual wrangler deploy
command. Moving the directory change to the step's working-directory
key drops cd from the script entirely, so the group label now reflects
the command that's actually running.

.github/workflows/ci.yml

@@ -106,11 +106,11 @@ jobs:
           npx astro build
 
       - name: Deploy to Cloudflare Pages
+        working-directory: docs/site
         env:
           CLOUDFLARE_API_TOKEN: ${{ secrets.CF_API_TOKEN }}
           CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CF_ACCOUNT_ID }}
         run: |
-          cd docs/site
           npx --yes wrangler pages deploy dist/ \
             --project-name=fish-config-docs \
             --branch=main \