Merge pull request #172 from LauraHilliger/gh-pages

updating urls
Merge pull request #173 from LauraHilliger/gh-pages

fixed multicourse page template with url for modified discourse
Merge pull request #174 from LauraHilliger/gh-pages

added some examples of trainings to the host page
Merge pull request #175 from LauraHilliger/gh-pages

added drm resources page, found course image, added videos
added badges pagegit add --all