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Handle scrolling to hash on page transition #38
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Browsers only automatically scroll to the URL hash on page load. Since we're doing client-side transitions, we need to handle that ourselves. Normally, Next.js would take care of that for us: https://github.com/zeit/next.js/blob/0b496a45e85f3c9aa3cf2e77eef10888be5884fc/packages/next/client/index.js#L112. However, since we have transitions, the element with the ID referenced by the hash doesn't actually exist when the page change "completes" from the perspective of Next.js, the automatic scrolling fails. This PR will attempt to scroll to the element referenced by the hash as soon as we know that the page is in the DOM after it starts transitioning in.
Fixes #35.