update workflow permission to write github pages (#204)

* update workflow permission to write github pages

* Update deploy-docs.yml

* give contents write permission

.github/workflows/deploy-docs.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: write
+
 # This job installs dependencies, builds the docs, and pushes it to
 # the `gh-pages` branch of the same repository.
 jobs: