Offline build support

[dcode]

As a user, I need the ability to install Timelion as a Kibana plugin offline so that I can install it on disconnected systems and/or integrate it into lifecycle management processes (development, testing, production).

This should be similar to how Marvel provides offline install support as a Kibana plugin.

[dcode]

Note that instructions for manually building and doing this on my own are sufficient for now.

[rashidkpc]

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