Update acknowledgments

index.md

@@ -44,7 +44,11 @@ and install a Python interpreter.
 
 ### Acknowledgments
 
-Sections of this course material use data obtained from the [EU Open Data Portal][eu-odp], licensed under [CC-BY 4.0][cc-by-legal].
-A copy of this data is included in the [source repository](https://git.embl.de/grp-bio-it-workshops/intermediate-python).
+- The template of these pages is adapted from [The Carpentries Lesson Template][styles].
+- Sections of this course material use data obtained from the [EU Open Data Portal][eu-odp], licensed under [CC-BY 4.0][cc-by-legal].
+  A copy of this data is included in the [source repository](https://git.embl.de/grp-bio-it-workshops/intermediate-python).
+- The lockdown data used in [Working with Data](../02-data/) was adapted from
+[this Wikipedia page](https://en.wikipedia.org/wiki/COVID-19_pandemic_lockdowns#table-of-pandemic-lockdowns),
+accessed on 2020-06-24.
 
 {% include links.md %}