feat: use jekyll native timestamp to replace .github action approach

.github/workflows/ci_pr.yml

@@ -1,45 +1,45 @@
-name: CI Pipeline for Pull Requests
+# name: CI Pipeline for Pull Requests
 
-on:
-  pull_request:
-    branches: ["main"]
+# on:
+#   pull_request:
+#     branches: ["main"]
 
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
+#   # Allows you to run this workflow manually from the Actions tab
+#   workflow_dispatch:
 
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
-permissions:
-  contents: write
+# # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+# permissions:
+#   contents: write
 
-jobs:
-  # Auto-generate date job to update _config.yml
-  update-ci-last-modified-date:
-    name: Update ci_last_modified_date in _config
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v5
-        with:
-          ref: ${{ github.head_ref }}
-          persist-credentials: true
-          fetch-depth: 0
+# jobs:
+#   # Auto-generate date job to update _config.yml
+#   update-ci-last-modified-date:
+#     name: Update ci_last_modified_date in _config
+#     runs-on: ubuntu-latest
+#     permissions:
+#       contents: write
+#     steps:
+#       - name: Checkout
+#         uses: actions/checkout@v5
+#         with:
+#           ref: ${{ github.head_ref }}
+#           persist-credentials: true
+#           fetch-depth: 0
 
-      - name: Set date
-        id: set_date
-        run: |
-          date_value=$(date +'%Y-%m-%d')
-          echo "date_yyyy_mm_dd=$date_value" >> $GITHUB_ENV
-          echo "date=$date_value" >> $GITHUB_OUTPUT
+#       - name: Set date
+#         id: set_date
+#         run: |
+#           date_value=$(date +'%Y-%m-%d')
+#           echo "date_yyyy_mm_dd=$date_value" >> $GITHUB_ENV
+#           echo "date=$date_value" >> $GITHUB_OUTPUT
 
-      - name: Update _config.yml
-        uses: mikefarah/yq@master
-        with:
-          cmd: yq -i '.ci_last_modified_date = "${{ steps.set_date.outputs.date }}"' _config.yml
+#       - name: Update _config.yml
+#         uses: mikefarah/yq@master
+#         with:
+#           cmd: yq -i '.ci_last_modified_date = "${{ steps.set_date.outputs.date }}"' _config.yml
 
-      - name: Commit and Push
-        uses: stefanzweifel/git-auto-commit-action@v7
-        with:
-          commit_message: "ci: Auto-update date to ${{ steps.set_date.outputs.date }}"
-          file_pattern: "_config.yml"
+#       - name: Commit and Push
+#         uses: stefanzweifel/git-auto-commit-action@v7
+#         with:
+#           commit_message: "ci: Auto-update date to ${{ steps.set_date.outputs.date }}"
+#           file_pattern: "_config.yml"

_config.yml

@@ -204,5 +204,4 @@ compress_html:
   #   envs: all
 sass:
   quiet_deps: true # https://github.com/just-the-docs/just-the-docs/issues/1541
-  silence_deprecations: ["import"] # https://github.com/just-the-docs/just-the-docs/issues/1607
-ci_last_modified_date: "2025-11-18" # automatically updated by GitHub Actions workflow ci_pr.yml. The format is 'YYYY-MM-DD'.
+  silence_deprecations: ["import"] # https://github.com/just-the-docs/just-the-docs/issues/1607

_includes/footer_custom.html

@@ -2,7 +2,8 @@
   <p class="text-small text-grey-dk-100 mb-0">{{ site.footer_content }}</p>
 {%- else -%}
 {%- if page.created_date and page.created_date != '' -%}First created: {{ page.created_date | date: "%B %d, %Y" }} <br> {% endif -%}
-Last updated: {{ page.last_modified_date | default: site.ci_last_modified_date | date: "%B %d, %Y"}}
+Last updated: {{ site.time | date: "%Y-%m-%d"}}
+<!-- Last updated: {{ page.last_modified_date | default: site.ci_last_modified_date | date: "%B %d, %Y"}}
 {%- if site.workshop_series_name and site.workshop_series_name != '' -%}
   <p class="text-small text-grey-dk-100 mb-0"> This workshop is part of the {{ site.workshop_series_name }}</p>
 {%- endif -%}
@@ -26,7 +27,7 @@
     {%- endif -%}
     .
   </p>
-{%- endif -%}
+{%- endif -%} -->
 {%- if site.license_name and site.license_url and site.license_image_url -%}
 <p><a target="_blank" rel="noopener noreferrer" href="{{ site.license_url }}"><img src="{{ site.license_image_url }}" alt="{{ site.license_name }} icon" style="height:2.5em;"></a></p>
 {%- else -%}