Refactor documentation to work with Docusaurus

[beeme1mr]

Overview

The current documentation consists of markdown files in GitHub. While this does work, it's a poor user experience. This issue is to refactor the documentation to work with Docusaurus, so it can be included in the OpenFeature docs as a subsection. The goal is to provide a user-friendly and organized documentation site that includes all the core OpenFeature projects.

Requirements

• Refactor the current documentation to work with Docusaurus
• Create an organized and user-friendly documentation site
• Extend the documentation to answer the following questions:
  • What's the OpenFeature Operator (OFO)?
  • What problem does it solve?
  • How it works
  • What features are included
  • How does it relate to OpenFeature?
• Ensure that the documentation is easy to maintain and update
• Automatically generate CRD docs #392

Resources

Argo CD: https://argo-cd.readthedocs.io/en/stable/
Docusaurus documentation: https://docusaurus.io/docs/
Docusaurus GitHub repository: https://github.com/facebook/docusaurus
Current documentation: https://github.com/open-feature/flagd/tree/main/docs