Merge #19453

19453: README.md: Remove HiL Badge r=aabadie a=MrKevinWeiss

### Contribution description

Since the HAW-Hamburg hack and change to the RIOT community server the HiL is not operating.  We should remove it until it is brought back. likely with some improvements and with different links.


### Testing procedure

Before this PR: click on it  and be sad
After PR: Forget your sorrows

### Issues/PRs references



Co-authored-by: MrKevinWeiss <weiss.kevin604@gmail.com>

README.md

@@ -1,5 +1,4 @@
 [![Nightly CI status master][master-ci-badge]][master-ci-link]
-[![Nightly HiL CI overview][hil-ci-badge]][hil-ci-link]
 [![GitHub release][release-badge]][release-link]
 [![License][license-badge]][license-link]
 [![API docs][api-badge]][api-link]
@@ -165,5 +164,3 @@ https://www.riot-os.org
 [twitter-link]: https://twitter.com/RIOT_OS
 [wiki-badge]: https://img.shields.io/badge/docs-Wiki-informational.svg
 [wiki-link]: https://github.com/RIOT-OS/RIOT/wiki
-[hil-ci-link]: https://hil.riot-os.org/results/nightly/latest/overview
-[hil-ci-badge]: https://img.shields.io/badge/CI-HiL-blue