Anchor links for kroxylicious.io

[k-wall]

It'd be nice if content headings on the kroxylicious.io had copy/pastable anchor links to that users could easily refer to content from other places.

[gracegrimwood]

The jekyll-toc plugin has a Liquid filter that does exactly this. We can use inject_anchors on content where relevant to inject anchor links on headings.

Note that this won't apply to the docs because that content is compiled and rendered in a different repository, and doesn't use Jekyll.