Enable Mixpanel to Capture metrics and relevant data

[franck-boullier]

We'd like to use Mixpanel to display dashboard and relevant data so we can monitor and improve Unee-T

This issue captures our progress to acheive that.

A new parameter 'MIXPANEL_SNIPPET' has been created in the AWS parameter store for the PROD envo to record the Mixpanel JS snippet for this environment.

[franck-boullier]

Snippet for the DEV envo created in the AWS parameter for the DEV envo

[kaihendry]

So we are having both Mixpanel and Google Analytics, right?

[franck-boullier]

yes right we'll have both for now.

[franck-boullier]

Current implementation in eec2d9e still needs some tweaks: code should be environment specific.