Describe custom/minimal theme/layout creation

[SteveDesmond-ca]

As a new Statiq user, I'd like to know how to create a simple reusable layout without downloading a full-fledged theme, so that I can make my site look nice without unnecessary bloat.

Even just a sentence or two somewhere around "use the standard ASP.NET/Razor concepts: _ViewStart, _ViewImports, _Layout" could be a helpful pointer in the right direction.