Eureka for Aha!

This is an opinionated extension that aims to fix styling and functional issues I've had with Aha. A full list of what it does is as follows:

• Simplify the top bar menu to only surface commonly used links.
• Hide search by default, remove that extra header bar as it's no longer needed.
• Allow hiding of releases you don't wish to see.
• Remove references to goals, initiatives, and aha! score on the features board
• Expose comment form all the time on feature board.
• Adjust styles for features to make them more readable.