Add breaking dam 2D to sidebar and subprojects

[uekerman]

According to precice/tutorials#279

[MakisH]

I had to do a few steps to make it work:

1. Trigger the update submodules workflow
2. Pull master
3. Merge master into this branch and push
4. Fix one issue (Liquid syntax error) in an fmi-runner markdown file that was making the website building to fail, and repeat. I also had to share the organization secret for workflow dispatches with that repository, so that it could actually trigger the update submodules, as intended.