quick start guide: Remove usage of Ananke theme

[jmooring]

hugo new site quickstart
cd quickstart
git init
git submodule add https://github.com/theNewDynamic/gohugo-theme-ananke.git themes/ananke
echo "theme = 'ananke'" >> hugo.toml
hugo new posts/post-1.md
hugo new posts/post-2.md
hugo new posts/post-3.md
hugo new posts/post-4.md
hugo -D

Error: error building site: render: failed to render pages: render of "home" failed: "/home/user/projects/quickstart/themes/ananke/layouts/index.html:48:23": execute of template failed: template: index.html:48:23: executing "main" at <.Site.GetPage>: can't evaluate field Site in type string

Someone broke the Ananke theme last week:
theNewDynamic/gohugo-theme-ananke#665

There's an open PR to fix it:
theNewDynamic/gohugo-theme-ananke#685

[jmooring]

@yardie After correspondence with the Ananke theme author, we're going to document use of the minimal theme created by hugo new theme foo instead. The Ananke theme has not been updated to include newer Hugo features, and it is unlikely to be updated in the near future.

[jmooring]

Closing this for now. The Ananke theme has a new maintainer (@davidsneighbour) who has already addressed the deprecation warnings.