Add Table of Contents component

[jrubenoff]

Closes #9.

Preview pages

• Table of Contents

Changes

• Adds the eleventy-plugin-nesting-toc package
• Adds the Table of Contents to the main layout

Notes

To keep merge conflicts to a minimum, I'm using the file structure that I noticed web.dev's 11ty instance using:

• Each shortcode's markup is in its own dedicated file in _includes.
• The common-tags package strips out whitespace, ensuring the component renders correctly.

I also moved markdown-it config to a separate file, markdown.js, so that we can properly render Markdown within shortcodes. (See this section of the 11ty docs for a description of the problem, and this blog post for more context around the solution here.)

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