Add og:url meta tag to ourbigbook.liquid.html template

Co-authored-by: cirosantilli <[email protected]>

Author: Copilot

ourbigbook.liquid.html

@@ -6,7 +6,9 @@
 <script type="application/ld+json">{"name":"Ciro Santilli","url":"https://cirosantilli.com"}</script>{% endif %}
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.10.1/css/all.min.css" integrity="sha512-9my9Mb2+0YO+I4PUCSwUYO7sEK21Y0STBAiFEYoWtd2VzLEZZ4QARDrZ30hdM1GlioHJ8o8cWQiy8IAb1hy/Hg==" crossorigin="anonymous" referrerpolicy="no-referrer">{% unless is_index_article %}
-<link rel="canonical" href="https://ourbigbook.com/cirosantilli/{{ toplevel_id }}">{% endunless %}
+<link rel="canonical" href="https://ourbigbook.com/cirosantilli/{{ toplevel_id }}">{% endunless %}{% if is_index_article %}
+<meta property="og:url" content="https://cirosantilli.com">{% else %}
+<meta property="og:url" content="https://ourbigbook.com/cirosantilli/{{ toplevel_id }}">{% endif %}
 <style>{{ style }}</style>
 <link rel="stylesheet" type="text/css" href="{{ raw_relpath }}/main.css">
 <link rel="shortcut icon" type="image/x-icon" href="{{ github_prefix }}/ID_photo_of_Ciro_Santilli_taken_in_2013_square_398.jpg">