Finish Documentation

Add remaining docs:

• home:
  • Contents
  • UML State Diagram
• connectors:
  • gpio
  • http
  • nvs
  • rtos
  • sntp
  • wifi

Add links to xTaskCreate() RTOS docs in existing docs.

Add following new features to existing docs:

• api: check_code_task
• latch: callback feature

(Optional) Use Wiki Feature!