Customisable catalogue sort

[byjpr]

Open the sorting functions to allow devs to choose how their navigation is structured.

[byjpr]

Currently I have created:

1. 2 custom structs, Category, and Module.
2. Item component, and tree component
3. Transpiler that takes the current components from Util.get_components_info/0 and turns it into the custom structs

To-do: Figure out how to allow hooking and transformation.

[byjpr]

We now have a fully working extendable sorting system for modules. I've included two examples of sorting functions that are enabled by default.

• CategoryFirst will sort catalogues/categories to the top of each list
• ByCatalogueABC will sort each catalogue (not categories) in alphabetical order

The two examples also show how you can sort at different levels, by either doing a deep sort (the entire AST) or you could do a shallow sort where you only do top-level (or really any level you would like).

What was my motivation?
I'm currently working on Shopify Polaris for Elixir (for my own personal fun), and wanted to be able to order the docs in the same way that is shown on the Polaris docs without needing to use Module Names for sorting.