Add sphinx-notfound-page to configure styled 404 pages
#586
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Popular extension:
https://sphinx-extensions.readthedocs.io/en/latest/
https://github.com/readthedocs/sphinx-notfound-page
https://sphinx-notfound-page.readthedocs.io/en/latest/
See the current 404 page:
📚 Documentation preview 📚: https://cloudstack-documentation--586.org.readthedocs.build/en/586/