chore: housekeeping, use garbados-crypt over tweetnacl

[garbados]

garbados-crypt relies on native crypto and bundles pretty small.

Additionally, housekeeping:

• Use transform-pouch to keep the databases in sync.
• Use GH Actions over Travis for CI.
• Expand testing harness to include browser testing.

For reference, npm run build:min produces a 125kb package.

[coveralls]

Pull Request Test Coverage Report for Build 1053099836

• 39 of 40 (97.5%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.2%) to 93.75%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
index.js	39	40	97.5%
<!--	Total:	39	40	97.5%	-->

Totals
Change from base Build 54:	2.2%
Covered Lines:	64
Relevant Lines:	65

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💛 - Coveralls