Create pull_request_template.md

.github/pull_request_template.md

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+### Preview Links
+
+
+
+### Checklist 
+
+- [ ] Every page is page one
+- [ ] Tested how-to docs. If not, note why here. 
+- [ ] all pages contain meta data
+- [ ] Updated [sources.yaml](https://github.com/Kong/developer.konghq.com/blob/main/tools/track-docs-changes/config/sources.yml). For more info review [track docs changes](https://github.com/Kong/developer.konghq.com/tree/main/tools/track-docs-changes)
+- [ ] This PR links docs to existing docs.