Accessibility: attach enter key pressing to the handler intercepting clicks on Docet links

[mcRoot]

Docet links are manager via a handler intercepting just clicks: in order to provide a greater deal of accessibility for people with blind disabilitiy to intercept also enter keypressing on these links as these is the mechanism adopted by them to surf canonical links. Also, would be good to render these links by adding the aria attribute role with value link (role=link).