Upgrade to latest Next.js (attempt 2)

[srmagura]

• Closes Upgrade Emotion website to the latest Gatsby or Next.js #2536.
• Closes Horizontal scrolling reduces readability of website code snippets #2640.
• Please merge Add "no longer maintained" message awesome-emotion#17.

The original PR is here: #2571. This is a rebase of that PR with some added fixes.

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