Redirects for site migration

[hexagoncircle]

- Summary

Templates can now be discovered in the Integrations Hub on netlify.com at netlify.com/integrations/templates. Notice had been given on templates.netlify.com that it will be deprecated and redirected to netlify.com. This PR introduces a _redirects file, which gets added to the output directory through a small eleventy config update that will pass the file through to the root.

• Related issue: https://github.com/netlify/marketing/issues/2312

- Test plan

• Review redirect mapping tab in the templates.netlify.com migration Google doc
• Ensure list of redirects are properly set up for domain-level redirects [Netlify docs]

- Description for the changelog

Adds page redirects to new home for templates on netlify.com

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[stephan1echung]

@MarcL @taty2010 It looks like we'd need to merge these changes to actually test the redirects, but please let us know if we can test redirects differently. Also, would either of you have the bandwidth to review this PR? If not, no worries, we'll go ahead and merge and test, and if it doesn't work as expected, we can revert and troubleshoot.

[MarcL]

@hexagoncircle @stephan1echung - Thanks for doing this.

re: testing - can we not use relative redirects rather than the full domain and then test on a deploy preview? I do this on my own site and it works.

[hexagoncircle]

re: testing - can we not use relative redirects rather than the full domain and then test on a deploy preview?

It does work indeed – Thank you, @MarcL!