Update and remove obsolete application desktop files

[arcticicestudio]

Some XDG application .desktop files are not required anymore because the latest upstream versions have been adapted and improved to match the custom configurations:

• JetBrains IntelliJ IDEA Ultimate Edition binary /opt/intellij-idea-ultimate-edition/bin/idea.sh is now linked to /usr/bin/idea and /usr/bin/intellij-idea-ultimate-edition. The desktop file is now named uniform /usr/share/applications/jetbrains-idea.desktop.
• JetBrains IntelliJ IDEA Community Edition binary /opt/intellij-idea-community-edition/bin/idea.sh is now linked to /usr/bin/idea. The desktop file is now named uniform /usr/share/applications/jetbrains-idea.desktop.
• JetBrains Webstorm binary /opt/webstorm/bin/webstorm.sh is now linked to /usr/bin/webstorm and the desktop file is now named uniform /usr/share/applications/jetbrains-webstorm.desktop.
• JetBrains Pycharm Community Edition binary /opt/pycharm-community-edition/bin/pycharm.sh is now linked to /usr/bin/pycharm, bu the desktop file is still named /usr/share/applications/pycharm.desktop.

• Atom 1.28 included an upgrade to Electron 2.0 and now ships with an standalone launcher(/usr/lib/atom/atom) instead of using the Electron binary (electron <BINARY_PATH>).