[microhil] Docs support

[vroncevic]

• preparing sphinx project setup
• checking integration doxy-doc and sphinx-doc
• add UM for microHIL

[vroncevic]

Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer via the Micro USB cable, and release the button when the computer recognizes a removable hard drive (RPI-RP2).