docs: Add contributing sections to homepage

packages/docs/pages/contributing/contribution-guide.md

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+# Contribution Guide
+
+We are happy that you want to contribute to Automatisch. We will assist you in the contribution process. This guide will help you to get started.
+
+## We develop with GitHub
+
+We use GitHub to host code, track issues, and feature requests, as well as accept pull requests. You can follow those steps to contribute to the project:
+
+1. Fork the repository and create your branch from the `main`.
+2. Create your feature branch (`git checkout -b feature/feature-description`)
+3. If you've added code that should be documented, update the documentation.
+4. Make sure to use the linter by running `yarn lint` command in the project root folder.
+5. Create a pull request!
+
+## Use conventional commit messages
+
+We use [conventional commit messages](https://www.conventionalcommits.org) to generate changelogs and release notes. Therefore, please follow the guidelines when writing commit messages.
+
+## Report bugs using GitHub issues
+
+We use GitHub issues to track public bugs. Report a bug by [opening a new issue](https://github.com/automatisch/automatisch/issues/new).
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the AGPL-3.0 license.

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).

packages/docs/pages/contributing/repository-structure.md

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+# Repository Structure
+
+We use `lerna` with `yarn workspaces` to manage the mono repository. We have the following packages:
+
+```
+.
+├── packages
+│   ├── backend
+│   ├── cli
+│   ├── docs
+│   ├── e2e-tests
+│   ├── types
+│   └── web
+```
+
+- `backend` - The backend package contains the backend application and all integrations.
+- `cli` - The cli package contains the CLI application of Automatisch.
+- `docs` - The docs package contains the documentation website.
+- `e2e-tests` - The e2e-tests package contains the end-to-end tests for the internal usage.
+- `types` - The types package contains the shared types for both the backend and web packages.
+- `web` - The web package contains the frontend application of Automatisch.