Move all development commands to project.json

[charlesBochet]

Scope & Context

We are shifting to the following guideline to bring clarity in the Developer XP:

• production commands are located in the package.json and do not require nx
• development command (for contributors / individuals working on the project) should be located in project.json and require nx

The change has been done for twenty-server in: https://github.com/twentyhq/twenty/pull/4644/files

1) We should also do it for all other typescript packages 2) we should introduce a root project.json containing the main start command

[pacyL2K19]

We need to reflect these changes in the documentation as well Currently some parts of the doc are broken due to #4644 eg.

Should every PR associated with this issue come with an update on the documentation? Or you are planning another approach?

@charlesBochet

[pacyL2K19]

I can work on this @charlesBochet @FelixMalfait

[charlesBochet]

Hi @pacyL2K19, feel free to work on it, assigning it to you The documentation has been updated (there is currently a slight delay between the PR being merged and the documentation being deployed)