Summary:
Add spinner and refactor container view to be router
add `NylasStore` as a global importable. specs for APIEnv
login page fixes
add old fixes to container view
finish extracting pages
fix onboarding flow
Test Plan: edgehill --test
Reviewers: bengotow
Reviewed By: bengotow
Differential Revision: https://phab.nylas.com/D1652
