fix: fix root start script (#5032)

Fixes #5022

See https://nx.dev/recipes/running-tasks/root-level-scripts#setup

packages/twenty-docs/docs/contributor/server/server.mdx

@@ -14,30 +14,30 @@ import DocCardList from '@theme/DocCardList';
 ## Useful commands
 
 These commands should be exectued from packages/twenty-server folder.
-From any other folder you can run `yarn nx <command>` twenty-server.
+From any other folder you can run `npx nx <command>` twenty-server.
 
 ### First time setup
 
 ```
-yarn nx database:reset # setup the database with dev seeds
+npx nx database:reset # setup the database with dev seeds
 ```
 
 ###  Starting the app
 
 ```
-yarn nx start
+npx nx start
 ```
 
 ### Lint
 
 ```
-yarn nx lint
+npx nx lint
 ```
 
 ### Test
 
 ```
-yarn nx test:unit
+npx nx test:unit
 ```
 
 ### Resetting the database
@@ -45,7 +45,7 @@ yarn nx test:unit
 If you want to reset the database, you can run the following command:
 
 ```bash
-yarn nx database:reset
+npx nx database:reset
 ```
 
 :::warning

packages/twenty-docs/docs/start/local-setup/troubleshooting.mdx

@@ -24,11 +24,11 @@ If you don't, make sure you don't have more than one postgres instance running o
 
 ## Cannot find module 'twenty-emails' or its corresponding type declarations.
 
-You have to build the package `twenty-emails` before running the initialization of the database with `yarn nx run twenty-emails:build`
+You have to build the package `twenty-emails` before running the initialization of the database with `npx nx run twenty-emails:build`
 
 ## Missing twenty-x package
 
-Make sure to run yarn in the root directory and then run `yarn nx server:dev twenty-server`. If this still doesn't work try building the missing package manually.
+Make sure to run yarn in the root directory and then run `npx nx server:dev twenty-server`. If this still doesn't work try building the missing package manually.
 
 ## Lint on Save not working
 

packages/twenty-docs/docs/start/local-setup/yarn-setup.mdx

@@ -182,7 +182,7 @@ yarn
 
 Setup your database with the following command:
 ```bash
-yarn nx database:reset twenty-server
+npx nx database:reset twenty-server
 ```
 
 Start the server and the frontend:

packages/twenty-docs/docs/start/self-hosting/docker-compose.mdx

@@ -44,7 +44,7 @@ FILE_TOKEN_SECRET=replace_me_with_a_random_string_refresh
 If you encounter errors, (not able to log into the application after inputting an email) after the inital setup, try running the following commands and see if that solves your issue.
 ```
 docker exec -it twenty-server-1 yarn
-docker exec -it twenty-server-1 yarn nx database:reset
+docker exec -it twenty-server-1 npx nx database:reset
 ```
 
 ### Cannot connect to server, running behind a reverse proxy