add pid code for SlimeNRF devices

Author: sctanf

1209/7691/index.md

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+---
+layout: pid
+title: SlimeNRF Receiver Bootloader
+owner: SlimeVR
+license: MIT OR Apache-2.0
+site: https://github.com/SlimeVR/SlimeNRF-Receiver
+source: https://github.com/SlimeVR/SlimeNRF-Receiver
+---
+UF2 bootloader for SlimeVR receiver

1209/7692/index.md

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+---
+layout: pid
+title: SlimeNRF Tracker
+owner: SlimeVR
+license: MIT OR Apache-2.0
+site: https://github.com/SlimeVR/SlimeNRF-Tracker
+source: https://github.com/SlimeVR/SlimeNRF-Tracker
+---
+SlimeVR smol rotation-based vr trackers

1209/7693/index.md

@@ -0,0 +1,9 @@
+---
+layout: pid
+title: SlimeNRF Tracker Bootloader
+owner: SlimeVR
+license: MIT OR Apache-2.0
+site: https://github.com/SlimeVR/SlimeNRF-Tracker
+source: https://github.com/SlimeVR/SlimeNRF-Tracker
+---
+UF2 bootloader for SlimeVR smol slime