[Shock] - Make it easier to create local links in Markdown

[matthew-carroll]

As of the work for #180, local links are created in Markdown by adding Jinja processing.

This is tedious for two reasons:

• Most/all Markdown pages now require the user to specify a contentRenderers list with Jinja added.
• Any code sample or example that might include Jinja syntax now needs to be surrounded with {% raw %} and {% endraw %} to escape Jinja processing.

There should be an easy way to create local links in Markdown without involving Jinja. Jinja can create local links for templates and components, and Markdown can create local links for Markdown.