Update twenty-front commands (#4667)

# This PR

- Moves dev and ci scripts to the `project.json` file in the
twenty-front package
- Adds a project.json file in the root of the project with the main
start command that start both twenty-server and twenty-front
applications concurrently
- Updates the script command of the root project with the start:prod
command (replacing the start command which will be used in dev with the
help of nx)
- Add a start:prod command in the twenty-front app, replacing the start
command (now used for dev purpose)

Issue ref #4645 

@charlesBochet @FelixMalfait please let me know how can I improve it

---------

Co-authored-by: Thaïs Guigon <guigon.thais@gmail.com>

packages/twenty-front/vite.config.ts

@@ -1,4 +1,5 @@
 import react from '@vitejs/plugin-react-swc';
+import path from 'path';
 import { defineConfig, loadEnv } from 'vite';
 import checker from 'vite-plugin-checker';
 import svgr from 'vite-plugin-svgr';
@@ -19,7 +20,7 @@ export default defineConfig(({ command, mode }) => {
 
   const checkers: Checkers = {
     typescript: {
-      tsconfigPath: 'tsconfig.app.json',
+      tsconfigPath: path.resolve(__dirname, './tsconfig.app.json'),
     },
     overlay: false,
   };