Standalone PWA

[BhasherBEL]

Summary

This PR add the ability to install focalboard as a standalone progressive web app on compatible devices.

Ticket Link

This is a first easy fix for #160

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[BhasherBEL]

/check-cla

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[dontcrash]

Hoping this PR gets merged!

[rondDev]

Looks good to me, don't see any reason this shouldn't be merged

[R-Hammer]

Looking forward to the merge and this app!

[juanico10]

What state is this PR in?

[BhasherBEL]

What state is this PR in?

Like many PR/issues on this repo, it's waiting for someone to look at it.