added "impressum.html" (will be loaded into "index.html"),
changed few style-settings (deleted gap between "home"-icon and
navigation-tree, set vertical-alignment of td.annoName to "top", to
improve usability of the "expand table-row"-function, changed background
color of the body)
Merge branch 'feat_rightAlignment' into develop

Conflicts:
	src/test/resources/homepage/css/style.css