Add feedback templates and cookbook

[duriantaco]

Summary

• Add issue forms to collect concrete jq pain points, JSON edge cases, and workflow requests.
• Add a cookbook page focused on the researched product direction: unknown JSON -> inspect -> query -> useful output.
• Link the cookbook from the docs nav and README.

Direction

This keeps jonq focused on JSON exploration and extraction instead of blindly expanding toward a database or ETL system. The templates should help us collect real examples before committing to more features.

Validation

• python -m pre_commit run --all-files
• LC_ALL=C LANG=C python -m sphinx -b html docs/source /tmp/jonq-docs-feedback-cookbook
• python -m jonq tests/json_test_files/simple.json "select id, name, city" --format csv
• python -m jonq tests/json_test_files/simple.json "select nme"
• python -m jonq tests/json_test_files/nested.json "select order_id, item, price from [].orders if price > 700" -t
• python -m jonq tests/json_test_files/simple.json "select name" -r