Doc: Move partition migration to official documentation

docs/UpgradePartition.md

@@ -1,21 +1,3 @@
 # Upgrade Partition
 
-To be able to install further updates you have to update the partition table of the ESP32. Doing so will **erase** all configuration data. Over The Air update using the web interface is **NOT** possible!
-
-**So make sure you export a backup of your configuration files before continuing.**
-
-There are several possibilities to update the partition table:
-
-- Using Visual Studio Code or PlatformIO CLI
-
-   If you have already used Visual Studio Code or the `platformio` command you can use it again to install the latest version. The partition table is upgraded automatically.
-
-- Any kind of flash interface
-
-   If you like to use any kind of flash interface like `esptool.py`, Espressif Flash Download Tool, ESP_Flasher or esptool-js you have to make sure to upload the provided .factory.bin file. It is important to enter the correct target address.
-
-   | Address  | File                   |
-   | ---------| ---------------------- |
-   | 0x0      | opendtu-*.factory.bin  |
-
-After upgrading the ESP32 will open the intergrated access point (AP) again. Just connect to it using the default password ("openDTU42"). If you are connected, just visit <http://192.168.4.1> and enter the "Configuration Management". Recover the previously backuped config files.
+This documentation will has been moved and can be found here: <https://tbnobody.github.io/OpenDTU-docs/firmware/howto/upgrade_partition/>