docs: Add contributing sections to homepage

packages/docs/pages/contributing/development-setup.md

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+# Development Setup
+
+Clone main branch of Automatisch.
+
+```bash
+git clone git@github.com:automatisch/automatisch.git
+```
+
+Then, install the dependencies.
+
+```bash
+cd automatisch
+yarn install
+```
+
+## Backend
+
+Make sure that you have **PostgreSQL** and **Redis** installed and running.
+
+Create a `.env` file in the backend package:
+
+```bash
+cd packages/backend
+cp .env-example .env
+```
+
+Create the development database in the backend folder.
+
+```bash
+yarn db:create
+```
+
+Run the database migrations in the backend folder.
+
+```bash
+yarn db:migrate
+```
+
+Create a seed user with `user@automatisch.io` email and `sample` password.
+
+```bash
+yarn db:seed:user
+```
+
+Start the main backend server.
+
+```bash
+yarn dev
+```
+
+Start the worker server in another terminal tab.
+
+```bash
+yarn worker
+```
+
+## Frontend
+
+Create a `.env` file in the web package:
+
+```bash
+cd packages/web
+cp .env-example .env
+```
+
+Start the frontend server in another terminal tab.
+Open [http://localhost:3001](http://localhost:3001) with your browser to see the result. Then, use the `user@automatisch.io` email address and `sample` password to login.
+
+## Docs server
+
+```bash
+cd packages/docs
+yarn dev
+```
+
+You can check the docs server via [http://localhost:3002](http://localhost:3002).