Update mkdocs.yml

add electronics corner start

Author: mrosseel

mkdocs.yml

@@ -15,6 +15,7 @@ nav:
   - Bluetooth Speakers: infra/bluetooth_speakers.md
   - 3D Printer: infra/printer3d.md
   - 2D Printer: infra/printer2d.md
+  - Electronics corner: infra/electronics.md
   - Electricity: infra/electricity.md
   - Garbage: infra/garbage.md
   - CNC: infra/cnc.md