Added Google Analytics global site tag

[arjunr00]

Types of changes

• [ ] Bugfix (change which fixes an issue)
• [x] New feature (change which adds functionality)
• [ ] Refactor (change which changes the codebase without affecting its external behavior)
• [ ] Non-breaking change (fix or feature that would causes existing functionality to work as expected)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Purpose

Turns out our website is not configured for Google Site Analytics! According to the admin dashboard, we need to add a tag to the website so that Analytics can pick up data.

[arjunr00]

Never mind, it's already set up.