update readme

Author: Archmonger

README.md

@@ -1,5 +1,18 @@
 Temporary branch being used to rewrite ReactPy's documentation.
 
-Many of these pages are in progress, and are using the [original ReactJS pages](https://beta.reactjs.org/learn) as placeholders.
+Many of these pages are in progress, and are using the [original ReactJS docs](https://react.dev/learn) as placeholders.
 
 See live preview here: https://reactive-python.github.io/reactpy
+
+In order to set up an environment to develop these docs...
+
+1. Install [Python](https://www.python.org/downloads/) 3.9 or higher
+2. Fork and clone this repository
+3. _Optional_: Create a Python virtual environment with the following command: `python3 -m venv venv`
+4. _Optional_: Activate the virtual environment (this method will vary based on operating system)
+5. Install the dependencies with the following command: `pip install -r docs/requirements.txt`
+6. Run the following command: `mkdocs serve`
+7. Follow the on-screen prompts to view the documentation in your browser
+8. You can now edit the markdown files located within `docs/src/` and see the changes in real time
+
+Feel free to PR this branch with any changes you make to the documentation. If you have any questions, feel free to ask in the [Discord server](https://discord.gg/uNb5P4hA9X).