Simple search function

• Simple Search function with full text search.
• Source: https://github.com/christian-fei/Simple-Jekyll-Search

Closes #152 (closed)

_data/navigation.yml

@@ -35,6 +35,9 @@ header:
         - title: Jobs <i class="fas fa-bell"></i>
           url: "job_offers.html"
 
+        - title: <i class="fas fa-search"></i>
+          url: "search.html"
+
 footer:
          - title: Contact
            url: "contact.html"