remove .idea files from Git repo
remove .idea files from Git repo
refactor - move some classes and methods to grid_helpers.dart
remove .idea files from Git repo
add *.css.map (generated by SASS)
remove deprecated ignores
remove redundant `-` delimiter at the end of group names
remove redundant `-` delimiter at the end of group names
remove redundant `-` delimiter at the end of group names
improve design and code
support running content_shell tests