Update KMyMoney website to [jekyll](https://jekyllrb.com/) and [jekyll-kde-theme](https://invent.kde.org/websites/jekyll-kde-theme).
**Repository:** https://cgit.kde.org/websites/kmymoney-org.git/
Change in [jekyll-kde-theme](https://invent.kde.org/websites/jekyll-kde-theme) needed:
- [ ] Support for a blog/news feature