add mynode guide asset

page/mynode.md

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+How to disable datacarrier on Umbrel.
+===
+
+1. Login on your mynode device.
+2. Go to the bottom of the page and click on `settings`.
+
+<img src="../pictures/1-mynode.png" width="50%" height="50%" />
+
+3. Scroll to the Bitcoin section and click on `edit config`
+
+<img src="../pictures/2-mynode.png" width="50%" height="50%" />
+
+4. On the section "Additional Bitcoin Config" add `datacarrier=0` and click on save.
+
+<img src="../pictures/3-mynode.png" width="50%" height="50%" />
+
+Mynode will automatically restart and the change will be done!