Update starter components to include MD files for documentation

[Tregonia]

The existing setup does not include Markdown files that are used for documenting Patterns. Starter components can include a .md file to illustrate how this can be implemented.

Task

• Update patterns to include .md files that include documentation for Pattern.

[mariohernandez]

Hey @Tregonia could you provide initial markdown files for the components? I feel most components will be refactored to an extend when used in a new custom theme and the markdown file may become obsolete or out of sync with the new structure of the component. Should we keep this open?

[rlahoda]

I think this can be combined with the updated pattern of using markdown files for hiding files instead of the underscore since the underscore is being depreciated so we can create the markdown files for those initially to hide and start adding descriptions and helpful text to them as we continue

[mariohernandez]

The only pattern in which we are using underscore is the _icons-macro.twig. Can't remember if I already updated it to the new way of hiding it.