Change deployment branch to master

Author: emiliom

.github/workflows/deploy-docs.yml

@@ -32,6 +32,6 @@ jobs:
       if: github.ref == 'refs/heads/source' && github.repository == 'oceanhackweek/oceanhackweek.github.io'
       with:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        BRANCH: gh-pages
+        BRANCH: master
         FOLDER: _site
         CLEAN: false