Set up Google Analytics tracking with react-ga library. Added import …

[petrussola]

…in index.js and configured code as per their docs

Description

Set up Google Analytics tracking with react-ga library and initializing with new user id code as env variable

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Change status

• Complete, tested, ready to review and merge
• Complete, but not tested (may need new tests)
• Incomplete/work-in-progress, PR is for discussion/feedback

How Has This Been Tested?

Tracking needs to be tested in production, to check if visits convert to stats in the analytics dashboard.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation, if relevant
• I have run the app using my feature and ensured that no functionality is broken
• My changes generate no new warnings
• There are no merge conflicts

[ghost]

DeepCode's analysis on #5a1c4b found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 0 minor issues. ✔️ 0 issues were fixed.

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