Bugfix: In geojson example redirection to data source (#2335)

* fix: #2334

* lint

---------

Co-authored-by: Chris Gervang <[email protected]>
Co-authored-by: Chris Gervang <[email protected]>

Author: vineetjk

examples/geojson/src/control-panel.tsx

@@ -11,7 +11,10 @@ function ControlPanel(props) {
         see details.
       </p>
       <p>
-        Data source: <a href="www.census.gov">US Census Bureau</a>
+        Data source:{' '}
+        <a href="https://www.census.gov" target="_new">
+          US Census Bureau
+        </a>
       </p>
       <div className="source-link">
         <a