[codex] Clarify app.render view resolution

[Sean-Kenneth-Doherty]

Description of Problem

The app.render('email', ...) examples do not explain where Express looks for the email view. Issue #1457 asks where that template file is expected to live and how Express resolves it.

Closes #1457.

Proposed Solution

Add a short explanation to the English 3.x, 4.x, and 5.x app.render API includes:

• view can be absolute or relative to the views setting
• extensionless names use the view engine setting
• with views = './views' and view engine = 'pug', app.render('email', ...) renders ./views/email.pug

Additional Information

Validation:

• npm ci
• npm test
• git diff --check

I also attempted bundle exec jekyll build. Local Ruby is 3.4.8 while this repo pins Ruby 3.3.4, and Jekyll failed locally with cannot load such file -- erb under Ruby 3.4. Bundler was installed into vendor/bundle for the attempt; vendor is ignored and no generated bundle files are included in this PR.

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[Sean-Kenneth-Doherty]

I took a pass at rebasing this over the current Astro migration. The conflict is mechanical: the old Jekyll include files for app.render() were deleted upstream, and the same clarification now belongs in:

• src/content/api/3x/api/application/index.mdx
• src/content/api/4x/api/application/index.mdx
• src/content/api/5x/api/application/index.mdx

I resolved that locally and validated it with:

• npm run format:check
• npm run lint
• npm run build

The full build completed successfully (1222 page(s) built). I can't push the merge commit from this environment because updating the branch across the Astro migration touches new/changed .github/workflows/* files, and GitHub rejects this OAuth token without workflow scope. I restored the PR branch to its previous head so I wouldn't leave noisy workaround commits behind.