* remap mute, archive, and delete commands so they do not conflict with new thread switching commands
* add cmd+1 through cmd+9 hotkeys to jump to a conversation
Closes #127
* add keyboard shortcuts docs
* add jump to conversation blurb in features
* beautify contents to fix tabs vs spaces
* clean up keyboard short cuts table
* use radix when parsing int
* create a new const instead of mutating
* improve readability of ternary
* refactor event key check to improve readability
* remove check for 0 since it should never be passed
* remove unnecessary plus signs
