Fix DNS settings

[yufufi]

I've received the following from github:

The page build completed successfully, but returned the following warning for the master branch:

Your site's DNS settings are using a custom subdomain, www.deepnetwork.com, that's set up as an A record. We recommend you change this to a CNAME record pointing at deepnetworkgmbh.github.io. For more information, see https://help.github.com/en/github/working-with-github-pages/configuring-a-custom-domain-for-your-github-pages-site.

For information on troubleshooting Jekyll see:

https://help.github.com/articles/troubleshooting-jekyll-builds

If you have any questions you can contact us by replying to this email.

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