Revert "Re-enable jupyterlab-tour (#153)" (#158)

This reverts commit 7d36b8f.

Author: jtpio

requirements.txt

@@ -22,7 +22,8 @@ jupyterlab-fasta>=3.3.0,<4
 # JupyterLab: Geojson file renderer (optional)
 jupyterlab-geojson>=3.4.0,<4
 # JupyterLab: guided tour (optional)
-jupyterlab-tour
+# TODO: re-enable after https://github.com/jupyterlab-contrib/jupyterlab-tour/issues/82
+# jupyterlab-tour
 # JupyterLab: dark theme
 jupyterlab-night
 # JupyterLab: Miami nights theme (optional)