docs: update guides

frontend/README.md

@@ -4,13 +4,12 @@ This directory contains the Unleash Admin UI frontend app.
 
 ## Run with a local instance of the unleash-api
 
-First, start the unleash-api backend on port 4242.
-Then, start the frontend dev server:
+Refer to the [Contributing to Unleash](../CONTRIBUTING.md#how-to-run-the-project) guide for instructions.
+The frontend dev server runs simultaneously with the backend dev server:
 
 ```
-cd ./frontend
 yarn install
-yarn run start
+yarn dev
 ```
 
 ## Run with a sandbox instance of the Unleash API

website/docs/contributing/backend/overview.md

@@ -20,7 +20,7 @@ Before developing on this project you will need two things:
 
 ```sh
 yarn install
-yarn run start:dev
+yarn dev
 ```
 
 ## PostgreSQL {#postgresql}
@@ -65,14 +65,14 @@ In order to start the application you will need Node.js v14.x or newer installed
 // Install dependencies
 yarn install
 
-// Start server in development
-yarn start:dev
+// Start Unleash in development
+yarn dev
 
 // Unleash UI
-http://localhost:4242
+http://localhost:3000
 
 // API:
-http://localhost:4242/api/
+http://localhost:3000/api/
 
 // Execute tests in all packages:
 yarn test