EPIC: UI/UX Redesign

[esparr]

• Build a style guide#265
• Design Momentors Logo#269
• Users experience a updated, easy to use navigation bar#268
• As a mentor, I want to easily be able to add availability from my profile#278
• Mentors can look at their mentor sessions information from their profile page#266

[esparr]

@villeryd I added this epic so we can keep track of the tickets associated with this redesign. Let me know what stories you see us needing out of this redesign and I will get them added =)