GitLab

* At the end of the CI section of the blog post another sentence has
been added to provide a link to the other blog post on results from
the survey analysis.

Add metadata and picture of colleague to team page.

* Did a review of the blog post about the technology perspective
on the survey results.
* Added a new plot that depicts how much do researchers use version
control systems depending on how much they share their code.

* Add metadata and picture of colleague to team page.

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.17.0 to 3.17.2.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.17.0...v3.17.2)

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.16.0 to 3.17.0.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.16.0...v3.17.0)

Bumps [rouge](https://github.com/rouge-ruby/rouge) from 3.24.0 to 3.25.0.
- [Release notes](https://github.com/rouge-ruby/rouge/releases)
- [Changelog](https://github.com/rouge-ruby/rouge/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rouge-ruby/rouge/compare/v3.24.0...v3.25.0)

Bumps [rouge](https://github.com/rouge-ruby/rouge) from 3.23.0 to 3.24.0.
- [Release notes](https://github.com/rouge-ruby/rouge/releases)
- [Changelog](https://github.com/rouge-ruby/rouge/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rouge-ruby/rouge/compare/v3.23.0...v3.24.0)

Bumps [jekyll-feed](https://github.com/jekyll/jekyll-feed) from 0.15.0 to 0.15.1.
- [Release notes](https://github.com/jekyll/jekyll-feed/releases)
- [Changelog](https://github.com/jekyll/jekyll-feed/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll-feed/compare/v0.15.0...v0.15.1)

* Reorder checks which case is at hand.
* Put check whether event is a past event as the very first check.
* Check whether or not registration_state is 'over'.