chore(docs): consolidate contribution guides to docs/contribution

- Remove deprecated .github/CONTRIBUTOR_AND_GUIDES/ directory
- Add missing json templates to docs/contribution/templates_json/
- Update README.md links to point to docs/contribution/
- Update docs/contribution/CONTRIBUTING.md internal links

The contribution documentation is now centralized in docs/contribution/
with all templates (ct, install, json) available there.

Author: MickLesk