Add gitlab to social (alshedivat#229)

* Add gitlab to social

* Add gitlab to social integration

Author: seanpquinn

_config.yml

@@ -44,6 +44,7 @@ og_image: # The site-wide (default for all links) Open Graph preview image
 # -----------------------------------------------------------------------------
 
 github_username: # your GitHub user name
+gitlab_username: # your GitLab user name
 twitter_username: # your Twitter handle
 linkedin_username: # your LinkedIn user name
 scholar_userid: # your Google Scholar ID

_includes/social.html

@@ -14,4 +14,5 @@
   {% if site.wikidata_id %}<a href="https://www.wikidata.org/wiki/{{ site.wikidata_id }}" target="_blank" title="Wikidata"><i class="fas fa-barcode"></i></a>{% endif %}
   {% if site.strava_userid %}<a href="https://www.strava.com/athletes/{{ site.strava_userid }}" target="_blank" title="Strava"><i class="fab fa-strava"></i></a>{% endif %}
   {% if site.keybase_username %}<a href="https://keybase.io/{{ site.keybase_username }}" target="_blank" title="Keybase"><i class="fab fa-keybase"></i></a>{% endif %}
+  {% if site.gitlab_username %}<a href="https://gitlab.com/{{ site.gitlab_username }}" target="_blank" title="GitLab"><i class="fab fa-gitlab"></i></a>{% endif %}
 </span>