fix(ci): deploy with cloudflare/wrangler-action (pages-action was removed)

[nicolasiscoding]

Closes #177

Summary

cloudflare/pages-action was removed from GitHub (404 on gh api repos/cloudflare/pages-action), so every deploy fails at "Set up job" with: "Unable to resolve actions. Cannot access repositories 'cloudflare/pages-action'". Cloudflare's replacement is cloudflare/wrangler-action.

This replaces the "Deploy to Cloudflare Pages" step in .github/workflows/deploy.yml:

• uses: cloudflare/pages-action@v1 -> uses: cloudflare/wrangler-action@v4
• projectName: turbodocx-docs + directory: build -> command: pages deploy build --project-name=turbodocx-docs
• apiToken, accountId, and gitHubToken inputs are unchanged (same secrets)
• No branch input existed on the old step, so no --branch= flag was added

Same pattern as TurboDocx/DotCom#283, which is live and verified green in production.

Nothing else in the workflow was changed. Confirmed .github/workflows/deploy.yml is identical between develop and main (no separate fix needed there).

Test plan

• workflow YAML parses with no duplicate keys (validated with a PyYAML loader that raises on duplicate mapping keys)
• deploy run is green after merge