update all OAuth flows to use redirect callback instead of sending messages from a popup window

[zcesur]

pop-up windows don't have consistent behavior across different devices and browsers (see #135) so let's remove them

• org/dashboard_live.ex (735485b)
• onboarding/dev.ex (fix: update oauth flow to use redirect callback instead of sending messages from popup window #136)
• crowdfund.ex
• swift_bounties_live.ex
• org/bounties_new_live.ex
• org/settings_live.ex