Update docs.it4i/general/management/.gitkeep,...

Update docs.it4i/general/management/.gitkeep, docs.it4i/general/management/einfra-pswd.md, docs.it4i/general/management/einfra-ssh.md, docs.it4i/general/management/it4i-pswd.md, docs.it4i/general/management/it4i-ssh.md