Revert "SONAR-5646 Support of project-level widgets"

This reverts commit ad23fc889606b8d9e5c08ed5c165928e876f6384.
Revert "SONAR-5646 Initial dashborad js app"

This reverts commit 03dea21c4a826526aefb3a4287f3380a215f0956.
Revert "Initial attempt to write with ECMAScript 6"

This reverts commit 486ba9873739083df7cbbf3c5e129339404171dd.