Add Landing Page module to select city

[misaugstad]

Brief description of problem/feature

@jonfroehlich has brought this up before, and just mentioned it again on Slack. The idea of having a module on the landing page that holds a map, and you can select a city to explore from that map instead of using the drop down menu!

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[PKulkoRaccoonGang]

Synchronization was done manually in https://github.com/openedx/paragon/pull/3303 Closed