"Customization section" link in "Getting started" docs doesn't work if accessed directly via nav

[robbieaverill]

Griddle version

http://griddlegriddle.github.io/Griddle/docs/

Expected Behavior

Clicking "customization section" should take you to http://griddlegriddle.github.io/Griddle/docs/customization/

Actual Behavior

It takes you to http://griddlegriddle.github.io/Griddle/customization

Steps to reproduce

• Go to http://griddlegriddle.github.io/Griddle/docs/
• Navigate to "Architecture"
• Navigate back to "Getting started"
• Go to the bottom of the page and click "customization section"

Pull request with failing test or storybook story with issue

While this step is not necessary, a failing test(s) and/or a storybook story will help us resolve the issue much more easily. Please see the README for more information.

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Note that if you load the page directly, or refresh the page after loading it via the navigation links, the link is now correct.

The links were both changes in #19, neither link works in this context. It looks like you'd need to use prefixLink() on them, but since it's markdown syntax I'm not sure how you'd implement that.

Presumably this only affects the index page, since it doesn't have a name in the URL. Links like this are where the issue is:

<a href="../customization">customization section</a>