Header - Front End

[tony-opp]

Description

Let's rework the Header and navigation menu's Front End so that the app name is in the top-left, and all nav options are top-right.

[tony-opp]

The header has been updated.

• A placeholder app name is in the top-left, with all of the nav in the top-right
• Pets and Events nav options are functional drop-downs
• Mobile hamburger menu is functional

[mike-webster]

@tony-opp is that in a branch somewhere? Can you open a Pull Request so I can take a look?