Add documentation about ethernetless initial configuration

Karel Kocirequested to merge
ethernetless into tos-5.2

This should cover users without Ethernet socket in their laptops. It is only secondary way of initial configuration. Ethernet port is still the primary way to configure router.

This implements #90 (closed)

This should be merged/released only when %Turris OS 5.2.0 is released to HBS, otherwise it might confuse users I think.

Edited by Karel Koci

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