README - Fix link to psyplot GUI

Author: jomey

README.rst

@@ -15,7 +15,7 @@ You can
 
 These examples are automatically tested and deployed using CircleCI |circleci|
 
-.. _psyplot GUI: psyplot.readthedocs.io/projects/psyplot-gui
+.. _psyplot GUI: https://psyplot.github.io/psyplot-gui/
 .. _psy-view: https://psyplot.readthedocs.io/projects/psy-view
 
 
@@ -37,4 +37,4 @@ These examples are automatically tested and deployed using CircleCI |circleci|
 
 .. |circleci| image:: https://img.shields.io/circleci/build/github/psyplot/examples/main
     :alt: CircleCI
-    :target: https://app.circleci.com/pipelines/github/psyplot/examples
+    :target: https://app.circleci.com/pipelines/github/psyplot/examples