[$50] Updated UI: Discussion button moved from the left nav

[atelomycterus]

@jmgasper the discussion button moved from the left nav in MarvelApp:
Screen https://marvelapp.com/prototype/c06bg41/screen/77911790

The current design:

[jmgasper]

Challenge https://www.topcoder.com/challenges/65b5b40d-8c44-431a-9e39-3b6c9cd489b3 has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/65b5b40d-8c44-431a-9e39-3b6c9cd489b3 has been assigned to obog.

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[atelomycterus]

@jmgasper Please apply PR-#579. Thanks!

Testing

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