HIFIS relaunch newspost: redated to Sep 16

See merge request hifis/hifis.net!81

Bump html-proofer from 3.15.3 to 3.16.0

See merge request hifis/hifis.net!80

Bump rouge from 3.20.0 to 3.23.0

See merge request hifis/hifis.net!78

Bump jekyll-feed from 0.13.0 to 0.15.0

See merge request hifis/hifis.net!79

Bump jekyll from 4.1.0 to 4.1.1

See merge request hifis/hifis.net!77

Bumps [jekyll](https://github.com/jekyll/jekyll) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll/compare/v4.1.0...v4.1.1)

Link to TP lead job offer + rename to "Job Offer"

Closes #75

See merge request hifis/hifis.net!75

Formulation for Helpdesk (seemed like only applicable to homepage feedback)

See merge request hifis/hifis.net!76

Repos for Doc and Techdoc

See merge request hifis/hifis.net!74

News on VPN + helpdesk/homepage

Closes #69

See merge request hifis/hifis.net!71

Subscription to announce and news feeds

Closes #70

See merge request hifis/hifis.net!70

SCC/HZDR authors for corresponding news

Closes #68

See merge request hifis/hifis.net!65

changed roadmap link