Migrate to a monorepo folder architecture and migrate to yarn3

[charlesBochet]

Scope & Context

We want to migrate to a monorepo folder architecture where all projects will be hosted under ./packages folder:

• front, server and docs will move within ./packages folder

We will also switch to yarn3 which should optimize docker sizes (related to #965 and other investigations).

Once done, this should allow us a smoother interaction between sub-projects (especially twenty-ui, twenty-eslint and twenty-front and twenty-docs)

We will also aim to switch to vite if the performance is better (#2775)

Technical inputs

Example from our Medusa friends: https://github.com/medusajs/medusa

Feel free to chime in if you have advices on the best way to do it