Document pre-written recipes in web documentation

### What problem does your feature request solve?

The recipes included in CSET are not documented. They should be.

### Describe the solution you'd like

The bundled recipes should be in the reference section of the documentation. This section should be automatically generated from the recipes to ensure it stays up-to-date.

### Describe alternatives you've considered

Recipes currently can be viewed via `cset cookbook --details`, but it would be nicer to have them in the web documentation.

Start by inspecting the bundled recipes and the web documentation's reference section, then compare their content with `cset cookbook --details`. Determine how the reference pages are currently built and make the recipe documentation automatically reflect the bundled recipes; done means the recipes appear in the web reference and stay up to date.

Written by the indexing model from the issue text.