v2.0.0 - Sidebar, a more powerful config, refresh and more.

• Added a sidebar to display the contents of the hovered PR
  • Includes the PR description, status, checks, reviews and comments
• Changed the structure of the config
  • Renamed config to config.yml
  • Sections are now written purely using GitHub search filters
  • repos are not supported anymore
    • To migrate to the new config structure each repo can be replaced by a repo:some/repo in the filters property
  • defaults section supports configuration for the preview: if it should start open and what's its width.
• gh-prs now creates a default config.yml if one doesn't exist
• Ctrl-D and Ctrl-U now scroll the sidebar
• p toggles the preview
• Added refresh - pressing r will refresh all the sections