docs(readme): install jupyter-book in a venv

Author: kennethrioja

README.md

@@ -12,15 +12,30 @@ Built using [Jupyter Book 1](https://jupyterbook.org/). For additional guidance,
 
 ## Running locally and on GitHub Pages
 
-To run locally, install Jupyter Book then build:
+Requirements:
+
+- Python
+
+To run locally, install Jupyter Book in a virtual environment then build:
+
 ```shell
+python -m venv venv
+source venv/bin/activate
+pip install --upgrade pip
 pip install -U jupyter-book
 jupyter-book build TeSS_docs/
 ```
 
+And when you have finished, to quit virtual environment:
+
+```shell
+deactivate
+```
+
 We are hosting on GitHub Pages (using [Actions](https://github.com/ElixirTeSS/docs/blob/main/.github/workflows/main.yml)), using a different build command that means the `.html` part of the paths are not included. For example, we have page URLs like https://elixirtess.github.io/docs/accounts/user/ instead of ~~https://elixirtess.github.io/docs/accounts/user.html~~ -- this is achieved by rendering each page as a directory with its own `index.html` page. When running locally, this doesn't work so well, so use the default build command shown above.
 
 The build command in the GitHub Action includes:
+
 ```shell
 jupyter-book build --builder dirhtml TeSS_docs/
 ```