Remove warning

Author: mkhorton

docs_rst/introduction.rst

@@ -12,12 +12,6 @@ allowing Python developers to easily make an interactive web app to display mate
 As a showcase of the framework's capabilities, the Crystal Toolkit app allows you to import, view, analyze and
 transform crystal structures and molecules.
 
-.. warning::
-  If you use Crystal Toolkit to power your own web apps,
-  you are required to kindly ask your users to cite the Crystal Toolkit
-  paper. Likewise, if you use a Crystal Toolkit figure or analysis in
-  your own paper, please cite, thank you! Citations help us justify
-  further work on new features and maintenance of the code.
 
 Crystal Toolkit Demonstration App
 ---------------------------------