Update documentation for genome command

Author: chenv3

docs/usage/genome.md

@@ -8,7 +8,6 @@ This part of the documentation describes options and concepts for <code>cell-see
 If a reference genome that does not come with the pipeline, then a custom json file needs to be provided to run.
 
 This command does not help with creating the 10x compatible reference itself, that would need to be done separately. 10x documentation about the process can be found for [GEX](https://www.10xgenomics.com/support/software/cell-ranger/latest/analysis/inputs/cr-3p-references), [VDJ](https://www.10xgenomics.com/support/software/cell-ranger/latest/analysis/inputs/cr-5p-references), [ATAC](https://www.10xgenomics.com/support/software/cell-ranger-atac/latest/analysis/inputs/creating-a-reference-package-mkref), and [Multiome](https://www.10xgenomics.com/support/software/cell-ranger-arc/latest/analysis/inputs/mkref)
-[Singularity<sup>1</sup>](https://singularity.lbl.gov/)
 
 
 Creating a custom reference genome file is fast and easy! In its most basic form, <code>cell-seek <b>genome</b></code> only has *one required input* with the optional arguments supplying the reference paths.