DOC Remove project-template mention from the readme

Author: rth

README.rst

@@ -19,17 +19,9 @@ scikit-learn-extra - A set of useful tools compatible with scikit-learn
 
 .. _scikit-learn: https://scikit-learn.org
 
-**project-template** is a template project for scikit-learn_ compatible
-extensions.
-
-It aids development of estimators that can be used in scikit-learn pipelines
-and (hyper)parameter search, while facilitating testing (including some API
-compliance), documentation, open source development, packaging, and continuous
-integration.
 
 .. _documentation: https://scikit-learn-extra.readthedocs.io/en/latest/quick_start.html
 
-Refer to the documentation_ to modify the template for your own scikit-learn
-contribution.
+Refer to the documentation_ for additional information.
 
-*Thank you for cleanly contributing to the scikit-learn ecosystem!*
+*Thank you for contributing to the scikit-learn ecosystem!*