feat(common): add stylus file for login page
feat(common): add title to the login page
feat(common): change login column width and spacing
feat(common): add spacing below form
feat(common): change call-to-action (login) button width
feat(common): add stylus file for signup page
feat(common): imports other files
feat(common): add title and "body with class selector"
feat(common): change user flow phrase
feat(common): add grid styles to content
feat(common): set button width to reach side-to-side
fix(accounts): merge auth styles into one file
fix(accounts): remove content vertical spacing

This spacing will be declared on base.sty from now on.
fix(accounts): remove a bottom margin from the auth pages

The signup/login link paragraph was adding an extra space at
the end of the section.
Merge pull request #35 from brasilcomvc/feat/authentication-grid

Feature: Login and Signup Page