lock doc rendering to 0.25.6.1 (#81)

will need to upgrade it eventually.

Author: tedmoore

.github/workflows/pages.yaml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Install Mojo for mojo docs
         run: |
-          pip install mojo
+          pip install mojo==0.25.6.1
 
       - name: Create docs_md dir
         run: |