fix researchgate to use full url, per example in _config.yml

Author: staeiou

_includes/author-profile.html

@@ -38,7 +38,7 @@ <h3 class="author__name">{{ author.name }}</h3>
         <li><a href="https://keybase.io/{{ author.keybase }}"><i class="fas fa-key" aria-hidden="true"></i> Keybase</a></li>
       {% endif %}
        {% if author.researchgate %}
-        <li><a href="https://www.researchgate.net/profile/{{ author.researchgate }}"><i class="fab fa-researchgate" aria-hidden="true"></i> ResearchGate</a></li>
+        <li><a href="{{ author.researchgate }}"><i class="fab fa-researchgate" aria-hidden="true"></i> ResearchGate</a></li>
       {% endif %}
       {% if author.twitter %}
         <li><a href="https://twitter.com/{{ author.twitter }}"><i class="fab fa-twitter-square" aria-hidden="true"></i> Twitter</a></li>