docs(gh): add pr template for docs site

.github/pull_request_template.md

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+## Description
+
+<!-- Required. Briefly explain what changed and why. -->
+
+## Linked Issue
+
+<!-- Required. Example: Fixes #123 -->
+
+## Changes
+
+<!-- Required. List the main changes. Use bullets if helpful. -->
+
+## Manual Testing Steps
+
+<!-- Required. List the exact steps you used to verify the docs/site behaviour and check for regressions. -->
+
+1.
+2.
+3.
+
+## Screenshots (Optional)
+
+<!-- If the UI, layout, or rendered content changed at all, attach before/after screenshots, or a short recording. If it didn't, you can delete this section. -->
+
+## Additional Context (Optional)
+
+<!-- Add anything reviewers should know that does not fit above. -->
+
+## AI Disclosure
+
+<!-- Required. Use `None` if no AI tools were used. Example: Codex - helped draft and revise docs; I reviewed all changes. -->
+
+## Checklist
+
+- [ ] This PR links and implements an accepted issue.
+- [ ] This PR is a single focused change.
+- [ ] I ran the relevant validation for this change, such as `npm run build` and/or `npm run typecheck`.
+- [ ] I have added screenshots if there were any UI changes.
+- [ ] I have disclosed any AI usage as per the organization AI Policy above.
+- [ ] I understand all of my submitted changes.