Multiple ackee-tracker snippets in the domain modal

**🐣 Is your feature request related to a problem? Please describe.**

The domain modal currently only shows a simple ackee-tracker snippet, but [there're more way to include ackee-tracker on a site](https://github.com/electerious/ackee-tracker#-usage ).

**💡 Describe the solution you'd like**

A select box above the current snippet should allow it to switch between Automatically, Manually and Programmatic (see https://github.com/electerious/ackee-tracker#-usage).