Summary

Updated documentation describing the usage of Arduino-esp32 core as ESP-IDF component.

Impact

Removed confusing mentions of advanced menuconfig options.
Extended process of installation, setup, and usage.

Related links

Closes #5833

* Editing esp-idf_component docs

* Changed idt to ESP-IDF
Co-authored-by: NPedro Minatel <pminatel@gmail.com>

This PR is the initial documentation structure including the basic information about the project and Sphinx configuration.

####CONTENTS:
- Getting Started
- Installing
- Boards
- Libraries
- Library Builder
- Tutorials
- ESP-IDF as Component
- OTA Web Update
- makeEspArduino
- Troubleshooting
- Contributing

This PR also changes the README.md.