Update README.md

Author: rynge

README.md

@@ -1,6 +1,7 @@
 ## CVMFS Singularly Image Repository
 
-To add images to the repository for use on OSG, follow the instructions on the OSG
-Connect documentation pages below:
- - [Docker and Singularity containers](https://support.opensciencegrid.org/support/solutions/articles/12000024676-docker-and-singularity-containers#submitting-your-docker-container-to-the-open-science-grid-repository)
- - [Create a Docker Container Image](https://support.opensciencegrid.org/support/solutions/articles/12000058245)
+To add images to the repository for use on OSG, follow the instructions on the
+documentation pages below:
+
+ - [Containers Overview](https://portal.osg-htc.org/documentation/htc_workloads/using_software/containers-singularity/)
+ - [Containers - Docker](https://portal.osg-htc.org/documentation/htc_workloads/using_software/containers-docker/)