Update publish.yaml

Author: nsheff

.github/workflows/publish.yaml

@@ -3,7 +3,7 @@ on:
   workflow_dispatch:
   push:
     branches:
-      - master 
+      - main 
 
 permissions:
   contents: write
@@ -28,4 +28,4 @@ jobs:
           restore-keys: |
             mkdocs-material-
       - run: pip install mkdocs-material 
-      - run: mkdocs gh-deploy --force
+      - run: mkdocs gh-deploy --force