Adds news post for RSD launch

This is the news post for the RSD launch that is scheduled for today.

@jandt-desy @konrad @frust45 It would be great to hear you opinion about the post.

I could not figure out how to use breakpoints so that float-right is only for larger screens, e.g. > md.

Review link

_posts/2022/2022-07-29-hifis-rsd.md

@@ -33,7 +33,7 @@ Today, HIFIS is launching the prototype of our new cloud service, the Helmholtz
 
 This new cloud platform will become a central software directory for software that is developed within the Helmholtz Association.
 It is **tailored to Research Software Engineers and Researchers** that want to promote or discover research software.
-For the beginning of the test phase, we have added the [Software Spotlights](/spotlights) to the RSD, and will continuously update the list.
+For the beginning of the test phase, we have added the [Software Spotlights]({% link spotlights %}) to the RSD, and will continuously update the list.
 
 ### Future plans