Add Elite-Pi converter (#18236)

Co-authored-by: Joel Challis <[email protected]>

docs/squeezing_avr.md

@@ -192,6 +192,7 @@ That said, there are a number of Pro Micro replacements with ARM controllers:
 * [Adafruit KB2040](https://learn.adafruit.com/adafruit-kb2040)
 * [SparkFun Pro Micro - RP2040](https://www.sparkfun.com/products/18288)
 * [Blok](https://boardsource.xyz/store/628b95b494dfa308a6581622)
+* [Elite-Pi](https://keeb.io/products/elite-pi-usb-c-pro-micro-replacement-rp2040)
 
 There are other, non-Pro Micro compatible boards out there. The most popular being:
 * [WeAct Blackpill F411](https://www.aliexpress.com/item/1005001456186625.html) (~$6 USD)