Enhanced API docs, replaced placeholder FAQs, and added developer quickstart guide.

[LordAizen1]

This pull request introduces several improvements to the Mojaloop documentation:

1. Enhanced API Documentation:

   • Improved the structure and organization of the API documentation.
   • Fixed broken links and formatting issues.
   • Added sections on documentation tools and integration with core documentation.

2. Replaced Placeholder FAQs:

   • Replaced the template placeholder with relevant and accurate FAQs for Mojaloop.
   • Organized the questions into logical categories to help users find answers more easily.

3. Added Developer Quickstart Guide:

   • Created a detailed step-by-step guide for setting up a Mojaloop development environment.
   • Included setup instructions, prerequisites, and troubleshooting tips.
   • Provided instructions for running a test transfer and next steps for new developers.

These contributions aim to make it easier for new developers to get started with Mojaloop and improve the overall quality of the documentation.

[CLAassistant]

All committers have signed the CLA.