Helios64 Hardware Detailed Info (#27)

* Add detailed hardware info for Helios64
    - Button
    - Ethernet
    - Front Panel
    - GPIO
    - I2C
    - Jumper
    - LED
    - M.2
    - PMIC
    - PWM Fan
    - RTC
    - SATA
    - SPI
    - UEXT
    - UPS
    - USB

* Cosmetic upgrade and adapt to latest mkdocs-material version

Co-authored-by: nurix <nurix@pnsnc.local>
Co-authored-by: Aditya Prayoga <aditya@kobol.io>

docs/helios64/pmic.md

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+# Power Management IC (PMIC)
+
+The Rockchip RK808-D is a specially designed Power Management IC (PMIC) for the RK3399 System-on-Chip (SoC). The highly integrated device includes 4x buck DC-DC converters, 8x high performance LDOs, 2x low RDS switches, I2C interface, programmable power sequencing and an Real time clock (RTC).
+
+## Features
+
+* Input voltage range: 2.7V to 5.5V
+* 2MHz Switching Frequency for bucks
+* Current mode architecture for best transient performance
+* Internal compensation and soft start
+* I2C Programmable output levels and power sequencing
+* Real time clock (RTC)
+* High efficiency architecture
+* Integrated Vout Discharge Circuit for BUCK and LDO
+* Power:
+    + CH1: Synchronous Buck regulator, 5A max
+    + CH2: Synchronous Buck regulator, 5A max
+    + CH3: Synchronous Buck regulator, 3A max
+    + CH4: Synchronous Buck regulator, 2.5A max
+    + CH6,CH7,CH9,CH11: Linear regulators, 150mA max
+    + CH8: Low noise and high PSRR linear regulator,100mA max
+    + CH10,CH12,CH13: Linear regulators, 300mA max
+    + CH14: Low RDS switch, 0.2ohm@Vgs=3v
+    + CH15: Low RDS switch, 0.2ohm@Vgs=3v
+* Flexible Power Sequence control
+
+## Block Diagram
+
+![RK808-D Diagram](/helios64/img/pmic/rk808d-diagram.png)