Remove reference to StructTypes

Author: quinnj

.github/workflows/ci.yml

@@ -57,11 +57,6 @@ jobs:
             using Pkg
             Pkg.develop(PackageSpec(path=pwd()))
             Pkg.instantiate()'
-      - run: |
-          julia --project=docs -e '
-            using Documenter: doctest
-            using StructTypes
-            doctest(StructTypes)'
       - run: julia --project=docs docs/make.jl
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}