Docs: Bring back page to avoid link breaks

Author: nseidle

docs/firmware_update.md

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+# Updating RTK Device Firmware
+
+Torch: ![Feature Supported](img/Icons/GreenDot.png) / EVK: ![Feature Supported](img/Icons/GreenDot.png)
+
+The RTK Devices run a variety of firmware. Please see the device specific pages for more information about the update methods:
+
+## RTK Torch
+
+* [Updating ESP32 Firmware](firmware_update_stm32.md)
+* [Updating UM980 Firmware](firmware_update_um980.md)
+* [Updating STM32 Firmware](firmware_update_stm32.md)
+
+## RTK EVK
+
+* [Updating ESP32 Firmware](firmware_update_stm32.md)
+* [Updating u-blox Firmware](firmware_update_ublox.md)