1.5.0

• fix missing background for zero balance error
• [WIP] remove jquery ui in explorer tech-debt
• add Dan Lipert to team section
• Provides backend for unique referral code and shareable links
• Designs (avatars)
• [WIP] Front performance tech-debt
• purge styleguide-alpha tech-debt
• add meta title and description to explorer, homepage
• change featured bounty order
• hide why-gitcoin for logged in users
• onboard + grant/new fixes bug
• tech-debt: purge extra code tech-debt
• Allow grant creators to "speed up" contract deployment txn