Add workflow to push built doc to gh-pages

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    target-branch: "main"

.github/workflows/doc.yml

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+name: Documentation
+
+on: [push, pull_request]
+
+jobs:
+  Build:
+    # Use the "reusable workflow" from the hyperspy organisation
+    uses: hyperspy/.github/.github/workflows/doc.yml@main
+    with:
+      doc_build_path: './_build/html/'
+      # install only depencies using pip
+      install_dependencies_only: true
+
+  Push:
+    needs: Build
+    if: ${{ github.event_name != 'pull_request' && github.repository_owner == 'hyperspy' }}
+    permissions:
+      # needs write permission to push the docs to gh-pages
+      contents: write
+    # Use the "reusable workflow" from the hyperspy organisation
+    uses: hyperspy/.github/.github/workflows/push_doc.yml@main