Feat adds technology properties doc with arguments gathered by @raya and @rhatto

Thanks for @raya for gathering many of these arguments. Thanks also for @ahf and @nickm for checking the Onion Space address size.

Related to tpo/onion-services/onion-support#166

added Documentation Onion Services labels

requested review from @rhatto

assigned to @rhatto

approved this merge request

enabled an automatic merge when the pipeline for a496fea0 succeeds

merged

mentioned in commit 84e545b8