post-cover-image : add support for cover image for post

usage with post params =>
    cover = "<absolute image url>"

assets/css/post-entry.css

@@ -90,6 +90,13 @@
     font-size: 14px;
 }
 
+.entry-cover img {
+    border-radius: var(--radius);
+    margin-bottom: var(--gap);
+    pointer-events: none;
+    width: 100%;
+}
+
 .social-icons a {
     margin: 2px;
     padding: 6px;

layouts/_default/list.html

@@ -32,6 +32,11 @@
 {{- $class = "post-entry tag-entry" }}
 {{- end }}
 <article class="{{ $class }}">
+  {{ if .Params.cover }}
+  <figure class="entry-cover">
+    <img src="{{ .Params.cover | absURL }}" alt="cover image for {{ .Title }}">
+  </figure>
+  {{ end }}
   <header class="entry-header">
     <h2>
       {{ .Title }}

layouts/_default/single.html

@@ -14,6 +14,11 @@
     </div>
     {{end}}
   </header>
+  {{ if .Params.cover }}
+  <figure class="entry-cover">
+    <img src="{{ .Params.cover | absURL }}" alt="cover image for {{ .Title | plainify }}">
+  </figure>
+  {{ end }}
   {{ if .Params.ShowToc }}
   <div class="toc">
     <details>