nf-core/scrnaseq v2.3.2 "Sepia Samarium Salmon"

This release is focused simply on ensuring as many containers as possible are hosted on quay.io.

What's Changed

• Move containers for pipeline to quay.io by @drpatelh in #233
• Dev -> Master for 2.3.2 release by @drpatelh in #234

Full Changelog: 2.3.1...2.3.2