In the dokuwiki standard template __background__ is the variable
defining the background-color of the content. It is one of the
guaranteed placeholder that every template must provide. Hence we should
use it with the way it is used in the default template, so other plugins
can rely on it and look consistently.
Also some other base-dokuwiki styles still use it accordingly, for
example the footnotes.
SPR-954
Motivation
----------
Since we do not have a dashboard it would be useful to directly see
one's task on click upon the respective icon. Also this is most likely
the dominating reason of the dashboard-usage.
Implementation Decisions
------------------------
* Use SVG: Since we move towards using SVG everywhere in DokuWiki, I
decided to use a SVG icon here as well. This makes it compatible with
other templates too, without introducing an icon-font there.
* Using a `<span>` instead of a `<strong>`: I do not see the semantic reason
behind using a `<strong>` here.
Other Changes
-------------
* The styles related to the do-plugin have been moved from
css/area_nav-usertools.less to css/plugins/do_tasks.less
This needs the respective pull request merged from the do-plugin:
https://github.com/cosmocode/do/pull/31
SPR-962
