cssnano.co is dead, use web.archive.org instead

[stevepiercy]

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[stevepiercy]

@tiberiuichim you were the author of this page, and a link is now dead for an external site. Is the content still relevant? I assume it is, so I used a web.archive.org link, but if it is not, then I would prefer to remove the irrelevant content and link.

[ichim-david]

@tiberiuichim you were the author of this page, and a link is now dead for an external site. Is the content still relevant? I assume it is, so I used a web.archive.org link, but if it is not, then I would prefer to remove the irrelevant content and link.

@stevepiercy there is something wrong with the website but the package is still in active development. I would simply link to github https://github.com/cssnano/cssnano/blob/master/site/src/docs/what-are-optimisations.md

EDIT:
I noticed that the table isn't rendered in github as opposed to the deployed website as seen in the web archive so maybe not such a good advice, feel free to ignore ite

[stevepiercy]

Thanks for the lead. I subscribed to cssnano/cssnano#1569. Let's leave this PR open for now, and give them some time to respond. If they fix it, I'll close this PR, else point to the repo root.

[stevepiercy]

Closing in favor of #5853