fix: jail epair: fix infinity unlock wait for ethX Reported by: Karel Prasil via TG, Thanks!

• transferring docs from an external site to the project hierarchy in the form of MD documents;
• initenv: ability to reassign preseed config file with: args1=val1 args2=val2 ..
• jrestart: restart without checking status;
• vnet jails: allow non-epair based iface to pass as vnet ( as ppt_XXX interface );
• expose: continue to work, even if nc shows that the port is busy for UDP;
• support for OCI images via buildah tools (optional, experimental);