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
This should also fix an occasional fatal-error when all tasks on a page
are done.
We remove here also the $class from the button in the usertools, since
it served no apparent purpose.
SPR-936
