doc: add maintainers
doc: add maintainers

AlexNPavel/ignition,dgonyeo/ignition,AlexNPavel/ignition,higebu/ignition,marineam/ignition,dgonyeo/ignition,ajeddeloh/ignition,higebu/ignition,ajeddeloh/ignition,mischief/ignition,coreos/ignition,jonboulle/ignition,dgonyeo/ignition,trnubo/ignition,marineam/ignition,mischief/ignition,ajeddeloh/ignition,crawford/ignition,coreos/ignition,AlexNPavel/ignition,trnubo/ignition,marineam/ignition,higebu/ignition,jonboulle/ignition,crawford/ignition,trnubo/ignition,jonboulle/ignition,mischief/ignition,coreos/ignition