Add anchor for data sources on website

Adding an achor will allow deeplinks to
the list of supported data sources.

Signed-off-by: Georg J.P. Link <linkgeorg@gmail.com>

docs/_includes/data-sources.html

@@ -1,4 +1,4 @@
-<section class="page-section bg-primary text-white">
+<section class="page-section bg-primary text-white" id="data-sources">
     <div class="container text-center">
       <h3 class="page-section-heading text-uppercase">Supported data sources</h3>
         <div class="row text-left mt-5">
@@ -82,4 +82,4 @@ <h3 class="page-section-heading text-uppercase">Supported data sources</h3>
 
         </div>
     </div>
-  </section>
+  </section>