broken link to theming guide

[jrood]

Bug, feature request, or proposal:

On the getting-started page, the link to the theming guide is broken

What is the expected behavior?

that the link would take one to https://material.angular.io/guide/theming

What is the current behavior?

it goes to a blank page

What are the steps to reproduce?

go to https://material.angular.io/guide/getting-started
click the link at 'See the theming guide for instructions.'

What is the use-case or motivation for changing an existing behavior?

when developers use this documentation, they should be able to see how to include core themes and styles

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