We were opening these links in a new tab/window because we assume they
were external links.
But, on the one hand, we don't even know whether these links are
external, since they could also point to URLs from our site. And, on the
other hand, opening external links in new windows results in usability
issues as well [1, 2].
On top of that, old browsers have security issues when opening links in
new tabs unless we add `rel="noopener"` [3], and we aren't doing so.
[1] https://www.nngroup.com/articles/new-browser-windows-and-tabs
[2] https://css-tricks.com/use-target_blank
[3] https://mathiasbynens.github.io/rel-noopener/
This way it'll be easier to change them.
Note that there were two `.document-link` elements which aren't part of
a `.documents` element. We're renaming the HTML class of the link in
investments because it didn't contain links to download documents and
are slightly duplicating the CSS in the poll answer documents in order
to keep the `word-wrap` property.
Dashboard routes have been refactored. Now instead of having resources
for dashboard and routes inside a dashboard namespace the proposal
routes contain a dashboar singleton containing everything related to it.
