add coauthor credit feature

TODO.md

@@ -2,3 +2,4 @@
 * photo gallery thing for grouped together images, looking kinda like message thing in like discord or telegram
 * add an rss feed next to the atom feed for Reasons that came to me in a dream last night but i forgort
 * fix template rendering error when multiple posts have same publishing date
+* add some more OG article tags specifically on article, and generally more metadata tags that may ever so slightly help with SEO and whatnot

src/_includes/layouts/default.njk

@@ -16,7 +16,7 @@
     <meta property="og:image" content="{% if feature_image %}{{ site.url }}{{ feature_image }}{% else %}{{ site.url }}/img/cover.jpg{% endif %}">
     {% if feature_alt %}<meta property="og:image:alt" content="{{ feature_alt }}">{% endif %}
     <meta property="og:site_name" content="{{ site.title }}">
-    <meta name="article:author" content="{{ site.name }}">
+    <meta name="article:author" content="{{ site.name }}{% if coauthor %},{{ coauthor.name }}{% endif %}">
     {% if page.date %}<meta name="article:published_time" content="{{ page.date | date_to_datetime }}">{% endif %}
     <meta name="twitter:card" content="summary_large_image">
     <meta name="twitter:site" content="{{ site.twitter }}">

src/_includes/layouts/post.njk

@@ -16,7 +16,7 @@ subhead: blog
                 <span class="middot"></span>
                 <span class="readtime">{{ content | timeToRead }} to read</span>
                 <span class="middot"></span>
-                <span>by <span class="author by" id="author">{{ site.name }}</span></span>
+                <span>by <span class="author by" id="author">{{ site.name }}</span>{% if coauthor %} and <a class="author by" id="author" href="{{ coauthor.link }}">{{ coauthor.name }}</a>{% endif %}</span>
                 {% if tags %}
                     <span class="middot"></span>
                     <span>in 

src/posts.njk

@@ -23,7 +23,7 @@ permalink: /posts/{% if pagination.pageNumber > 0 %}page/{{ pagination.pageNumbe
         <span class="middot"></span>
         <span class="readtime">{{ entry.content | timeToRead }} to read</span>
         <span class="middot"></span>
-        <span>by <span class="author by" id="author">{{ site.name }}</span></span>
+        <span>by <span class="author by" id="author">{{ site.name }}</span>{% if entry.data.coauthor %} and <span class="author by" id="author">{{ entry.data.coauthor.name }}</span>{% endif %}</span>
         {% if entry.data.tags %}
             <span class="middot"></span>
             <span>in 

src/tagged.njk

@@ -28,7 +28,7 @@ date: git Last Modified
               <small class="updated">(updated <time datetime="{{ entry.data.changed_date | date_to_datetime }}">{{ entry.data.changed_date | date_formatted }}</time>)</small>
           {% endif %}
           <span class="middot"></span>
-          <span>by <span class="author by" id="author">{{ site.name }}</span></span>
+          <span>by <span class="author by" id="author">{{ site.name }}</span>{% if entry.data.coauthor %} and <span class="author by" id="author">{{ entry.data.coauthor.name }}</span>{% endif %}</span>
           {% if entry.data.tags %}
               <span class="middot"></span>
               <span>in