A list of links is a very common pattern in the web, and we use it in
many places. Here we're applying it to one of the most simple ones; the
help page.
Generally speaking, I'm not a big fan of helpers, but there are methods
which IMHO qualify as helpers when:
* They do not deal with application objects but mainly strings and
arrays
* They return text or an HTML tag
* Their logic is simple and splitting it into several methods is not
necessary
Many Rails helpers, like `tag`, follow these principles.
