#571 - implement tag style for list page
         - buttons on hover - opacity 0.7
         - edit dataset align with the rest
#570
Merge remote-tracking branch 'origin/arti-layout-changes' into
dev-datasets-list-570

Conflicts:
	ckanext-hdx_theme/ckanext/hdx_theme/public/header.css
#571 - set tag size
Merge remote-tracking branch 'origin/arti-layout-changes' into dev-datasets-list-570
#570