Revert "fix version to use to avoid upgrading with a bad version"

html-minifier latest version is not corrected, no ore need to fix version

This reverts commit e8c12609adc2f81f2639a051bd77a6d792bf0ce7.
-improve presentation listing
--with favorite, invited, scheduled, speaker name
-add rating calculation based on ratings values
-add search filter form
-add local json payload to work without API access
-reorganize application layout to be simpler
-add responsive design with bootstrap