Adding keyboard shortcut for moderation

[NewJerseyStyle]

Problem:
When number of participants increases, number of comments to be moderated will overwhelm the administrator.

Suggested solution:
Adding keyboard shortcut can speed up the process and increase productivity.

Alternative suggestions:

• Adding more moderators will be more helpful but we will do it in another time

Additional context:
A Chrome extension was built before, now we want to integrate the feature within polis