Added grouping page to be able to link users to it

Troubleshooting.md

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+# Troubleshooting
+
+You can find here a list of common problems and a way to try to solve them:
+
+[Won't boot](Won't-boot)
+
+[Config Menu](Config-Menu)
+
+[Firmware upgrade](Update-firmware-troubleshooting)
+
+[Diagnose firmware update in Windows](Diagnose-firmware-update-in-Windows)
+
+[Receive Quality Issues](Help!-Im-not-receiving-anything!---Receive-Quality-Issues)
+
+[No TX/RX](preamplifier-ic-replacement)
+
+[H2+ speaker modifications](H2-Plus-speaker-modifications)
+
+[Dead Coin Cell Battery](Dead-Coin-Cell-Battery)
+
+[Factory Defaults](Factory-Defaults)
+
+[SD card not recognized by PC with the SD-card over USB selected](SD-card-not-recognized-by-PC-with-the-SD-card-over-USB-selected)
+
+[DFU overlay](DFU-overlay)