Add instructions to build the website to README.md (#20)

Add instructions to build and serve the website locally to `README.md`.
Add instructions to run notebooks using `nbconvert`. Add `nbconvert` to
`environment.yml`.

README.md

@@ -1,7 +1,108 @@
-# user-tutorials
-A set of user tutorials for SimPEG. Visit [https://simpeg.xyz/user-tutorials/](https://simpeg.xyz/user-tutorials/).
+# SimPEG User Tutorials
 
-For those developing tutorials and wishing to build the website locally, some trouble shooting items are:
+A set of user tutorials for SimPEG.
 
-* Updating MyST: `pip install -U mystmd`
-* After updating, `myst clean --all` to clean cached templates
+**Website of the tutorials:**
+[https://simpeg.xyz/user-tutorials](https://simpeg.xyz/user-tutorials/).
+
+
+## How to build the website locally
+
+The SimPEG User Tutorials were created using [Myst][mystmd.org]. Myst is
+capable of building the website from content stored in [Jupyter
+Notebooks][jupyter].
+
+We can build the website from the current content in the Jupyter Notebooks.
+This can be done in a few seconds with very slim resource requirements.
+
+Rerunning the notebooks is a more intensive task that will require significant
+amount of memory (specially for the computationally intensive notebooks) and it
+will take some time.
+
+Here you'll find instructions to:
+
+- [Build and the website locally](#build-and-serve-the-website-locally)
+- [Rerun notebooks in the repo](#rerun-notebooks)
+
+### Build and serve the website locally
+
+Start by cloning this repository:
+
+```bash
+git clone https://github.com/simpeg/user-tutorials
+cd user-tutorials
+```
+
+To build the website you'll need to [install `mystmd`][install-mystmd].
+Alternatively, you can create a `conda` environment using the `environment.yml`
+file:
+
+```bash
+conda env create -f environment.yml
+```
+
+Once you have `mystmd` installed, we can now build the website from its
+sources.
+
+#### Build and serve
+
+The following command will build the website and serve it locally, so you can
+preview it. Follow the instructions that will be prompted by the command to see
+the website:
+
+```bash
+msyt start
+```
+
+#### Build only
+
+The following command will build the website and store the HTML files in
+a new `_build` folder:
+
+```bash
+msyt build --html
+```
+
+#### Clean cached builds
+
+```bash
+myst clean --all
+```
+
+### Rerun notebooks
+
+Start by cloning this repository:
+
+```bash
+git clone https://github.com/simpeg/user-tutorials
+cd user-tutorials
+```
+
+And create a `conda` environment using the provided `environment.yml` file:
+
+```bash
+conda env create -f environment.yml
+```
+
+We can use `nbconvert` to rerun a notebook and overwrite its output cells
+in place.
+To rerun a single notebook, use:
+
+```bash
+jupyter nbconvert --to notebook --execute --inplace notebook.ipynb
+```
+
+To rerun all notebooks, use:
+
+> [!CAUTION]
+> Rerunning all notebooks is a computationally intensive task. Some notebooks
+> require significant amount of memory to allocate large sensitivity matrices.
+
+```bash
+jupyter nbconvert --to notebook --execute --inplace **/*.ipynb
+```
+
+
+[install-mystmd]: https://mystmd.org/guide/quickstart
+[jupyter]: https://jupyter.org
+[mystmd.org]: https://mystmd.org

environment.yml

@@ -8,6 +8,7 @@ dependencies:
   - mystmd
   # Notebook requirements
   - jupyter
+  - nbconvert
   - SimPEG==0.20.*
   - discretize==0.10.*
   - pymatsolver