(build) Disable Wyam documentation

Publishing of documentation using Wyam is not working correctly just now
on GitHub Actions. Rather than fight with this, I am going to just
disable it for now, since publishing is still working when running
locally. I will need to look into this later.

Author: gep13

.github/workflows/build.yml

@@ -30,9 +30,6 @@ jobs:
       TWITTER_ACCESS_TOKEN: ${{ secrets.TWITTER_ACCESS_TOKEN }}
       TWITTER_ACCESS_TOKEN_SECRET: ${{ secrets.TWITTER_ACCESS_TOKEN_SECRET }}
       COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
-      WYAM_ACCESS_TOKEN: ${{ secrets.WYAM_ACCESS_TOKEN }}
-      WYAM_DEPLOY_BRANCH: gh-pages
-      WYAM_DEPLOY_REMOTE: https://github.com/GitTools/GitReleaseManager
       CODECOV_REPO_TOKEN: ${{ secrets.CODECOV_REPO_TOKEN }}
       GPR_USER: gittools-bot
       GPR_PASSWORD: ${{ secrets.NUGET_GITHUB_TOKEN }}