Add possibility to define local avatar image (#63)

* Add possibility to define local avatar image

* Use absolute path to assets folder

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

Author: itrich

_config.yml

@@ -52,3 +52,5 @@ plugins:
 # Replaces the default avatar provider (gravatar)
 #avatar_source: github
 #github_username: bitbrain
+#avatar_source: local
+#avatar_path: /assets/avatar.png

_includes/author.html

@@ -3,6 +3,10 @@
         {% capture avatar_image %}
             https://github.com/{{ site.github_username }}.png
         {% endcapture %}
+    {% elsif site.avatar_source == "local" and site.avatar_path %}
+        {% capture avatar_image %}
+            {{site.avatar_path}}
+        {% endcapture %}
     {% elsif site.plugins contains "liquid-md5" %}
         {% capture avatar_image %}
             https://gravatar.com/avatar/{{ site.email | downcase | md5 }}?s=256