Managing a Hugo theme using git submodules

Introduction For this Hugo-powered website, I decided to use the Toha theme, available on Github. Although the documentation has a great “Getting started” guide, I was missing some steps on how to upgrade a theme to its current version. Following some comments, apparently this is not something that is done often, unless there are significant updates in either functionality or layout. I tend to disagree, so I want to make sure I have the correct steps at hand.