Add patchstack faq to readmes

[jeffpaul]

Description of the Change

This pull request updates documentation for the Distributor plugin, focusing on improving clarity and support resources. The most important changes include reorganizing sections in both README.md and readme.txt, adding a dedicated FAQ about reporting security bugs, and improving the formatting of feature descriptions.

Documentation improvements:

• Added a "Frequently Asked Questions" section to both README.md and readme.txt, including instructions on how to report security vulnerabilities through the Patchstack Vulnerability Disclosure Program. [1] [2]
• Moved and reformatted the "Support Level" section in README.md for better visibility and organization. [1] [2]
• Improved section formatting in readme.txt by converting feature and connection headers to WordPress standard (== Features ==, == Connections ==).

How to test the Change

Changelog Entry

Developer - Add Patchstack security-reporting FAQ.

Credits

Props @jeffpaul.

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.