Add a standard way of presenting references to elements of the standard

[robredpath]

E.g. the dashboard has this:

and the website has this:

[tillywoodfield]

Agreed to use font Roboto Mono

[robredpath]

@tillywoodfield and I discussed this last week - although we were keen to maintain a "computer-ey-feeling" font (and therefore have chosen a monospace font) we also want to make sure that we don't make this design feel like what the link leads to isn't for people who work in spreadsheets. I think we can do that through the choice of colours - and to that end I'm tending towards the styling already used on iatistandard.org