Rework google analytics to have richer tracking

[itsdouges]

• exception tracking

• event tracking e.g searching, adding tokens, deleting tokens, uploading images

• external link tracking e.g to wiki pages from games

See: https://developers.google.com/analytics/devguides/collection/analyticsjs/how-analyticsjs-works

See: https://philipwalton.com/articles/the-google-analytics-setup-i-use-on-every-site-i-build/

See: https://github.com/googleanalytics/autotrack