27524 standardise view modes

This PR normalises the way we present listings and views of all 'listable' content (i.e. News, Media, Blog, Publications etc.)

For each content type:
- Display Suite settings have been removed
- Standard, relatively similar view modes have been configured for Full, Teaser and Compact view modes
- Views have been switched to use Content > Teaser or Content > Compact instead of Fields
- Views displays have been consistently renamed, and a Frontpage block variant added for each one
- Views have Sticky sort ordering

Additionally:
- Blog Teaser view mode is gone
- A new "Compact" view mode is present, for Block listings
- The home page has been updated to use Frontpage blocks
- Some default content has changed slightly to present on the homepage