Log Message:
news/newsraft: Update to 0.23

Provided by Kevin Bloom via wip.

- set limits to feeds/sections with curly brackets in feeds config
- add system notifications via notification-command setting
- add pager-width setting, set it to 100
- add sorting to feeds menu
- add shift-west, shift-east and shift-reset actions
- remove items-count-limit setting
- remove initial-unread-first-sorting setting
- remove toggle-unread-first-sorting action
- merge foreground and background color settings
- bind toggle-explore-mode action to tab (^I)
- bind scroll down to select-next, bind scroll up to select-prev
- fix ignoring search query when marking items read/unread
- fix poor termination after invalid terminal size