ES06: demo app clean up

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# Date:      Mon May 9 15:08:23 2022 +0200
#
# On branch master
# Changes to be committed:
#	modified:   .gitignore
#	new file:   demo_tracks.csv
#	modified:   src/MusicLandscape/DemoApp.java
#	modified:   src/MusicLandscape/util/formatters/CSVTrackFormatter.java
#
# Untracked files:
#	Test Results - MusicLandscape.html
#
