README update

[maehr]

Link to the Page

https://github.com/Stadt-Geschichte-Basel/forschung.stadtgeschichtebasel.ch/blob/main/README.md

Describe the Issue

Add instructions for npm and uv.

## Installation

Use [Bundle](https://bundler.io/) to install all dependencies.

```bash
bundle install

Install uv for data processing.

pip install uv

Install Node.js dependencies.

npm install

Usage

Populate data.

npm run propulate

Run the development server.

bundle exec jekyll serve

Build for production.

rake deploy

### Are you able to create a Pull Request with the fix?

None