How to run OnlyOffice server repo and web-app repo on my local machine using ubuntu

Hi i am trying to run https://github.com/ONLYOFFICE/web-apps.git https://github.com/ONLYOFFICE/server.git these to repo of onlyoffice for backend and frontend on my local machine using ubuntu but i am not able to fine any entry point how to run backend of it and also not able to find package.json in web-app can anyone help me in this it will be great help

am using node.js and javascript i tried a lot but not able to find a way how to run it on my machine locally

@onlyOffice

I have tried everything to run these https://github.com/ONLYOFFICE/web-apps.git https://github.com/ONLYOFFICE/server.git frontend and backend repo on local machine but able to find way how to run it locally i am new and using node.js and javascript and i amnot able to find entry point of this project to run on my machine