* improve superset list view page layout
- less header spaces and stacks
- move pagination down to bottom
- apply material design style to 'add' action button
- will apply to all superset list view, like slices list, security tab lists etc.
* improve superset list view page layout
- less header spaces and stacks
- move pagination down to bottom
- apply material design style to 'add' action button
- will apply to all superset list view, like slices list, security tab lists etc.
* improve superset list view page layout
- less header spaces and stacks
- move pagination down to bottom
- apply material design style to 'add' action button
- will apply to all superset list view, like slices list, security tab lists etc.
* improve superset list view page layout
- less header spaces and stacks
- move pagination down to bottom
- apply material design style to 'add' action button
- will apply to all superset list view, like slices list, security tab lists etc.
* improve superset list view page layout
- less header spaces and stacks
- move pagination down to bottom
- apply material design style to 'add' action button
- will apply to all superset list view, like slices list, security tab lists etc.
* remove tabs from indentation
* fix merge conflicts
* adjust css after code merge
