Add event-page for Ghent chapter (#33)

Author: stijnvanhoey

pandas/index.html

@@ -108,7 +108,7 @@
              "lng": 17.0696869},
             {"title": "Ghent",
              "description": "Ghent Python user group",
-             "url": "",
+             "url": "https://stijnvanhoey.github.io/2018-pandas-documentation-sprint-Ghent/",
              "sponsor_image": "",
              "sponsor_url": "",
              "time": "10am",