Write a linter ingredient handler for data.link_lists

[ddbeck]

A follow up to #320

We need an ingredient handler for data.link_lists.

[Elchi3]

In JS docs, we currently have 6 warnings about this:

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6 warnings landing-page/data.link_lists/handler-not-implemented

[wbamberg]

As I understand it we have decided to treat landing pages as guide pages for the moment, because implementing structured landing pages is seen as not a priority for us. So perhaps the best thing to do here would be to change the tag->recipe mapping in the linter so it identifies pages tagged as "landing-page" to be guide pages?

[Elchi3]

I think that makes sense. Lets treat them as guide page for now.