Configure error pages to render public/index.html
Configure error pages to render public/index.html

Why
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We need this because as far as the React app is concerned,
http://spool.video/the-traveling-wilburys/handle-with-care is a 404.
However, this is a legitimate page, and we can only know that once the
React app has rendered in the browser.

How
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https://github.com/heroku/heroku-buildpack-static#custom-error-pages

brainix/vh1,brainix/vh1