add 0xCB Gemini and update Helios imgages

_board/0xcb_gemini.md

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+---
+layout: download
+board_id: "0xcb_gemini"
+title: "0xCB Gemini Download"
+name: "Gemini"
+manufacturer: "0xCB"
+board_url:
+ - "https://github.com/0xCB-dev/0xCB-Gemini"
+board_image: "0xcb_gemini.jpg"
+date_added: 2024-11-11
+family: raspberrypi
+features:
+  - USB-C
+  - Breadboard-Friendly
+  - Castellated Pads
+---
+
+The 0xCB Gemini is our Waveshare RP2040-Zero compatible microcontroller. It includes all the features of it's bigger brother, the [0xCB Helios](https://circuitpython.org/board/0xcb_helios/), in a much smaller form factor.
+
+## Technical details
+
+- **Powerful RP2040** 32-bit Cortex M0+ dual core running at 133 MHz and 264kB SRAM.
+- **16MB/128Mb QSPI FLASH** chip for storing files and code
+- 3.3V 500mA LDO, PTC fuse and **ESD protection** chip
+- 4 pins configurable as **analog inputs**
+- GPIO16 is level shifted to 5v to drive the **onboard aRGB LED** (DIO is connected to GP16)
+- **USB VBUS detection** on GPIO19 for split keyboard side detection
+- **UF2 bootloader** for drag & drop programming via your file manager
+- easy to use **Single button boot and reset circuit** push to reset and hold >500ms to enter bootloader
+- 4 pads for use with an external USB socket/daughterboard
+- **USB-C connector** lets you access built-in ROM USB bootloader and serial port debugging
+
+## Purchase
+
+- [KeebSupply](https://keeb.supply/products/0xcb-gemini)