Fix Singularity link

Fix Singularity link

content/guides/running_applications/using_singularity.md

@@ -3,7 +3,7 @@ title = "Using Singularity"
 description = "How to use the Singularity containerization software on HCC resources."
 +++
 
-[Singularity](http://singularity.lbl.gov)
+[Singularity](https://www.sylabs.io/singularity/)
 is a containerization solution designed for high-performance computing
 cluster environments.  It allows a user on an HPC resource to run an
 application using a different operating system than the one provided by
@@ -73,7 +73,7 @@ and indicate you would like to use Singularity.
 ### What if I need other Python packages not in the image?
 {{% notice info %}}
 An alternative to the steps below is to create your own custom image as
-[described farther down](what-if-i-want-to-build-a-custom-image-to-use-on-the-hcc-clusters).
+[described farther down](#what-if-i-want-to-build-a-custom-image-to-use-on-the-hcc-clusters).
 Start with an HCC-provided image as the base for your Dockerfile (i.e. `FROM unlhcc/spades`)
 and add any additional packages you desire.
 {{% /notice %}}