Add square logo and desktop entry files (#6010)

* Add square logo and desktop entry files

* Install desktop file and icon using data files.

Co-authored-by: Karolina Surma <[email protected]>

Author: befeleme

jupyter-notebook.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Name=Jupyter Notebook
+Comment=Run Jupyter Notebook
+Exec=jupyter-notebook
+Terminal=true
+Type=Application
+Icon=notebook
+StartupNotify=true
+MimeType=application/x-ipynb+json;
+Categories=Development;Education