Configure javascript source maps for Sentry

[CeciliaHinga]

From tenfour-archive created by mackers: ushahidi/tenfour-archive#1016

Expected behaviour

• Sentry knows about the client release version and has source maps

Actual behaviour

• Sentry has no release version or source map for the TenFour client

https://docs.sentry.io/clients/javascript/sourcemaps/

[CeciliaHinga]

No longer needed b/c of Ionic