add support for favicon.ico file; related to daattali#1234 and daattali#1249

Author: daattali

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Unreleased version
 - BREAKING CHANGE: Allow changing the order of the social network links that appear in the footer (#1152)
 - BREAKING CHANGE: `google-scholar` social network link no longer requires the prefix `citations?user=`; if you previously set this parameter, it needs to be updated (#1189)
+- Added explicit support for favicons, you only need to add a `favicon.ico` file to the root directory
 - The footer of a page always sticks to the bottom, even on short pages (#576)
 - Added `author` YAML parameter to allow specifying the author(s) of a post (#1220)
 - Fixed bug where hovering over search results showed the text "{desc}" (#1156)

_includes/head.html

@@ -152,6 +152,11 @@
   <link rel="stylesheet" href="{{ "/assets/css/staticman.css" | relative_url }}">
   {% endif %}
 
+  {% assign favicon_exists = site.static_files | where: "path", "/favicon.ico" | size %}
+  {% if favicon_exists == 1 %}
+  <link rel="icon" href="{{ '/favicon.ico' | relative_url }}" />
+  {% endif %}
+
   {% if page.head-extra %}
     {% for file in page.head-extra %}
       {% include {{ file }} %}