Add some per-page metadata for testing

Author: MoenMi

src/_templates/layout.html

@@ -3,22 +3,18 @@
 {%- block extrahead %}
   {{ super() }}
 
-  {% set site_name = "Scholarly API Cookbook" %}
+  {% set site_name = "University of Alabama Libraries Scholarly API Cookbook" %}
   {% set base = (html_baseurl or "https://ua-libraries-research-data-services.github.io/UALIB_ScholarlyAPI_Cookbook/") %}
   {% set page_url = base ~ pagename ~ ('' if pagename.endswith('.html') else '.html') %}
 
   {# Prefer page description; fallback to a global site description #}
-  {% set site_desc = "Practical tutorials and examples for working with scholarly APIs, research metadata, and reproducible data workflows using Python and R." %}
+  {% set site_desc = "Example tutorials for working with scholarly APIs for academic scholarly research and teaching using Python and R." %}
   {% set page_desc = meta.get("description") if meta is defined else None %}
   {% set desc = page_desc or site_desc %}
 
   {# Allow per-page overrides for social #}
   {% set og_title = (meta.get("og:title") if meta is defined else None) or (title|striptags) %}
   {% set og_type  = (meta.get("og:type")  if meta is defined else None) or "website" %}
-  {% set og_image = (meta.get("og:image") if meta is defined else None) %}
-
-  {% set tw_card  = (meta.get("twitter:card") if meta is defined else None) or "summary" %}
-  {% set tw_image = (meta.get("twitter:image") if meta is defined else None) or og_image %}
 
   <!-- Canonical Link -->
   <link rel="canonical" href="{{ page_url }}" />
@@ -30,11 +26,6 @@
   <meta property="og:type" content="{{ og_type }}" />
   <meta property="og:url" content="{{ page_url }}" />
 
-  <!-- Twitter Card -->
-  <meta name="twitter:card" content="{{ tw_card }}" />
-  <meta name="twitter:title" content="{{ og_title }}" />
-  <meta name="twitter:description" content="{{ desc }}" />
-
   <!-- LD+JSON -->
   <script type="application/ld+json">
     {

src/about/introduction.rst

@@ -1,3 +1,7 @@
+.. meta::
+   :title: Scholarly API Cookbook Introduction
+   :og:type: article
+
 Introduction
 %%%%%%%%%%%%%%
 

src/python/chronam.ipynb

@@ -1,5 +1,16 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "---\n",
+    "title: Chronicling America API in Python\n",
+    "description: Tutorial for using the Chronicling America API with Python including use cases\n",
+    "og:type: article\n",
+    "---"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {