singularity: update file formats, replace shub with scloud (#3267)

pages/common/singularity.md

@@ -2,26 +2,26 @@
 
 > Manage Singularity containers and images.
 
-- Download a remote image:
+- Download a remote image from Sylabs Cloud:
 
-`singularity pull --name {{container.simg}} {{shub://vsoch/hello-world}}`
+`singularity pull --name {{image.sif}} {{library://godlovedc/funny/lolcow:latest}}`
 
 - Rebuild a remote image using latest Singularity image format:
 
-`singularity build {{container.simg}} {{docker://godlovedc/lolcow}}`
+`singularity build {{image.sif}} {{docker://godlovedc/lolcow}}`
 
 - Start a container from an image and get a shell inside of it:
 
-`singularity shell {{container.simg}}`
+`singularity shell {{image.sif}}`
 
 - Start a container from an image and run a command:
 
-`singularity exec {{container.simg}} {{command}}`
+`singularity exec {{image.sif}} {{command}}`
 
 - Start a container from an image and execute the internal runscript:
 
-`singularity run {{container.simg}}`
+`singularity run {{image.sif}}`
 
 - Build a singularity image from a recipe file:
 
-`sudo singularity build {{container.simg}} {{recipe}}`
+`sudo singularity build {{image.sif}} {{recipe}}`