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-ui/project.json

@@ -28,7 +28,8 @@
         "lintFilePatterns": [
           "{projectRoot}/src/**/*.{ts,tsx,json}",
           "{projectRoot}/package.json"
-        ]
+        ],
+        "cache": true
       },
       "configurations": {
         "fix": { "fix": true }
@@ -45,7 +46,12 @@
       "executor": "nx:run-commands",
       "options": {
         "cwd": "{projectRoot}",
-        "command": "tsc -b tsconfig.json --incremental"
+        "command": "tsc -b tsconfig.json",
+        "incremental": true
+      },
+      "configurations": {
+        "ci": { "incremental": false },
+        "watch": { "watch": true }
       }
     },
     "storybook:dev": {