added software news posts 2020 part 2

_posts/2020/02/2020-02-21-HIFIS-workshops-2020.md

_posts/2020/04/2020-04-15-smime-signing-git-commits.md

_posts/2020/04/2020-04-17-online-swc-at-hzdr.md

_posts/2020/04/2020-04-20-ML-hackathon.md

_posts/2020/06/2020-06-01-helpdesk-launch.md

_posts/2020/06/2020-06-11-HackyHour.md

_posts/2020/08/2020-08-19-introducing-consulting.md

_posts/2020/09/2020-09-23-getting-started-with-docker-1.md

_posts/2020/09/2020-09-25-getting-started-with-docker-2.md

_posts/2020/09/2020-09-29-getting-started-with-docker-3.md

_posts/2020/10/2020-10-15-survey-technology.md