feat: add extend_post_content.html hook partials for post sections (#1846)

Co-authored-by: Aditya Telange <21258296+adityatelange@users.noreply.github.com>

layouts/_partials/extend_post_content.html

@@ -0,0 +1,4 @@
+{{- /* Post content custom area start */ -}}
+{{- /*     Insert any custom code after post content - it will appear after the post body, before the footer. */ -}}
+{{- /*     Can be overwritten by partial with the same name in the global layouts. */ -}}
+{{- /* Post content custom area end */ -}}

layouts/single.html

@@ -42,6 +42,8 @@
   </div>
   {{- end }}
 
+  {{- partial "extend_post_content.html" . }}
+
   <footer class="post-footer">
     {{- $tags := .Language.Params.Taxonomies.tag | default "tags" }}
     <ul class="post-tags">