Add browser tests with Laravel Dusk

[karllhughes]

One way to prevent regression in this app as the codebase and feature set grows is to add browser (or acceptance) tests. I think Laravel Dusk makes sense given our stack.

Initial test cases

• User can submit email to log in, email sent to user
• User can log in with valid token
• User can create account and search with email and search term
• Logged in user can create search
• Logged in user can remove search
• Logged in user can see most recently collected jobs for a search