Keyboard navigation between comments

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Issue idea came from: https://gitlab.slack.com/archives/ux/p1487253326002264

Problem & Usecase

• Currently moving between comments is only possible with moving the viewport, easily switching between comments can improve efficiency.
• The added highlighting with the border color on the left improves this for less qualitative screens.

Proposal

• keyboard short cuts j and k
• make it look like:
• blue border moves with selected comment

Value

• Extra clear highlighting of comments with side border color.
• Ability to move between comments with keyboard, increasing efficiency.

Design

• Move up and down a comment with keyboard short cuts j and k
• Add image to the keyboard modal you can summon by pressing ?.
• Make the currently selected comment look like:
• Also update the URL with the currently selected comment, similar to as if you had clicked the comment timestamp.

cc: @JobV @awhildy @cperessini @smcgivern @victorwu