Added sidebar box with contact info about Snowden refugees

Signed-off-by: Jim Martens <github@2martens.de>

_data/author.yml

@@ -10,6 +10,7 @@ cv_pdf: /assets/pdf/cv.pdf
 generic_email: topic@2martens.de
 job_topic: jobs
 politics_topic: politik
+snowden_topic: snowden-refugees
 github_username: 2martens
 twitter_username: 2martens
 publications:

_includes/sidebar/snowden-refugees.html

@@ -0,0 +1,8 @@
+<div class="card sidebar mb-3">
+    <div class="card-body">
+        <p class="card-text">
+            Want to contact me with respect to the Snowden refugees?<br>
+            <span class="fas fa-envelope"></span>&nbsp;{{ site.data.author.generic_email }}, with topic = {{ site.data.author.snowden_topic }}
+        </p>
+    </div>
+</div>

pages/snowden-refugees.html

@@ -1,6 +1,7 @@
 ---
 title: Snowden Refugees
 permalink: /snowden-refugees/
+sidebarboxes: snowden-refugees
 ---
 
 <p>