Remove SBC's from documentation as they are not 'officially' supported

Author: spycat

docs/_inc/images/devices/indiedroid-nova.png

@@ -29,12 +29,8 @@ We provide builds for the following devices:
   * [Odroid Go Advance](hardkernel/odroid-go-advance)
   * [Odroid Go Super](hardkernel/odroid-go-super)
   * [Odroid Go Ultra](hardkernel/odroid-go-ultra)
-* Indiedroid
-  * [Nova](indiedroid/nova)
 * MagicX 
   * [XU Mini M](magicx/xu-mini-m)
-* Orange Pi
-  * [Orange Pi 5](orange-pi/orange-pi-5)
 * Powkiddy
   * [RGB10](powkiddy/rgb10)
   * [RGB10 Max 3 Pro](powkiddy/rgb10-max-3-pro)

docs/_inc/images/devices/orange-pi-5.png

@@ -231,12 +231,8 @@ nav:
         - Odroid Go Advance: devices/hardkernel/odroid-go-advance.md
         - Odroid Go Super: devices/hardkernel/odroid-go-super.md
         - Odroid Go Ultra: devices/hardkernel/odroid-go-ultra.md
-      - Indiedroid:
-        - Nova: devices/indiedroid/nova.md
       - MagicX:
         - XU Mini M: devices/magicx/xu-mini-m.md
-      - Orange Pi:
-        - Orange Pi 5: devices/orange-pi/orange-pi-5.md
       - Powkiddy:
         - RGB10: devices/powkiddy/rgb10.md
         - RGB10 Max 3 Pro: devices/powkiddy/rgb10-max-3-pro.md