docs: Rewrite and improve plugin documentation (#39)

* docs: Rewrite and improve plugin documentation

Updated structure, added version info, improved examples and linked external docs.

* docs: Update README.rst to reflect latest plugin configuration and structure

This commit updates the Tutor Paragon Plugin documentation to align with recent code changes and the approach outlined in the original proposal.

* docs: Add configuration update steps for theme hosting

Clarifies when to use tutor config save, tutor dev stop, and tutor dev start when updating theme variables. Adds step-by-step instructions to the documentation under the Static Hosting section.

* docs: add section on loading shared base Paragon styles and clarify version compatibility

This commit improves the documentation by:
- Adding a new section titled “Loading Base Paragon Styles” to guide site operators on how to optimize performance by using shared styles.
- Clarifying version compatibility in the “Version Compatibility” section.

* docs: improve  formatting for GitHub compatibility and clarity

* docs: improve README.rst - Hide ( `` )

Author: maguilarUXUI