WARNING: Non-consecutive header level increase

[rabernat]

These warnings appear frequently when building the book. Markdown headings need to be used consistently, e.g.

# Title

## Heading 1

### Heading 2

etc.

We need to go through the notebooks and fix all of these issues so that the warnings go away.

[rabernat]

Also related are these issues

home/runner/work/L96_demo/L96_demo/intro.md:1: WARNING: toctree contains reference to document 'notebooks/L96-description' that doesn't have a title: no link will be generated
/home/runner/work/L96_demo/L96_demo/intro.md:1: WARNING: toctree contains reference to document 'notebooks/gcm-analog-demo' that doesn't have a title: no link will be generated
...

etc.

[breichl]

This issue has been fixed in a couple of notebooks, but issues remain in the following:

• estimating-gcm-parameters.ipynb
• random_forest_parameterization.ipynb
• README.md.

[IamShubhamGupto]

#87 should fix this warning in the random_forest_parameterization.ipynb notebook

[dhruvbalwada]

@shan18 and @IamShubhamGupto - should this be closed now?

[shan18]

Yes, it can be closed now. These issues have been fixed.