feat: add navbar

feat: add navbar

initial setup

Initial commit from Create Next App

free memory from objects, add ability to safely exit

feat: print info about author, program and operator manual

add ability to store state of objects in files

feat: add ability to shoot for combat units

feat: add new specialization for soldier

feat: add flight speed for missiles

feat: add ability to move combat units

feat: add missile menu and ability to add or remove missile for a combat unit

feat: add more info on units page, fix: remove object id from depended objects when it's deleted

feat: add ability to check missing specializations of crew members in unit

feat: add ability to require specializations of crew members for units

refactor: change dir path of locales files

feat: add ability to navigate, manage units and battalions

added ability to add soldiers in the crew

addition to prev commit

partly completed unit's menu

new services and some changes in entities

controllers are divided into a service and repository, now they have different areas of responsibility

new services and some changes in entities