Enable CTRL+K to create links similar to Github functionality

[ac21]

Background

Mirroring functionality in Github simplifies transitioning to Codetree and improves the experience of users. In Github, when editing issue text, if you click CTRL+K you create a markdown hyperlink (e.g., []()).

Notes: https://docs.github.com/en/free-pro-team@latest/github/getting-started-with-github/keyboard-shortcuts#comments

Solution

Implement CTRL+K functionality in Codetree

[ac21]

Internal Use:
https://app.intercom.com/a/apps/he4q7g1x/inbox/inbox/2848986/conversations/63310800001279