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Helios64 Hardware Detailed Info (#27)

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* Add detailed hardware info for Helios64
    - Button
    - Ethernet
    - Front Panel
    - GPIO
    - I2C
    - Jumper
    - LED
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    - PWM Fan
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* Cosmetic upgrade and adapt to latest mkdocs-material version

Co-authored-by: nurix <nurix@pnsnc.local>
Co-authored-by: Aditya Prayoga <aditya@kobol.io>
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![Ethernet Location](/helios64/img/ethernet/ethernet.jpg)
Helios64 has 2x BASE-T Ethernet interfaces :
* LAN 1 : 1000BASE-T (1 Gbit/s)
* LAN 2 : 2.5GBASE-T (2.5 Gbit/s)
LAN 1 is the native Gigabit Ethernet interface from SoC RK3399. The interfaces is exposed through the Ethernet transceiver RTL8211F connected to RK3399 via RGMII.
![Ethernet 1GbE Diagram](/helios64/img/ethernet/helios64_1gbe_diagram.jpg)
LAN2 is the Multigigabit (2.5Gb) Ethernet interface provided through Realtek RTL8156 controller which is an USB3.0 to LAN bridge. The controller is connected to RK3399 via [VL815 USB 3.0 Hub](/helios64/usb/#usb-on-helios64).
![Ethernet 2.5GbE Diagram](/helios64/img/ethernet/helios64_2-5gbe_diagram.jpg)
## Features
Both Ethernet interfaces supports the following features :
* Transfer Rate Auto-Negotiation
* Full-duplex and Half-duplex operation
* IEEE 802.3az Energy Efficient Ethernet
* IEEE 802.1Q VLAN tagging
* Wake-on-LAN (WOL)
* Crossover Detection & Auto-Correction
* Automatic Polarity Correction
## About MAC address
Each Helios64 unit comes with a unique MAC address for each Ethernet interfaces. These MAC addresses, allocated and programmed during manufacturing process, comes from a MAC Address Block assigned to Kobol Innovations Pte. Ltd. by the IEEE Registration Authority.
The following MAC Address Block Medium (MA-M) has been allocated to us :
| 28-bit Base Value | EUI-48 Address Block |
|-------------------|----------------------|
| 64-62-66-D | 0-00-00 through F-FF-FF |