Upgrade to v0.27.19 to remove .bg-gradient2 on header nav buttons

[nickick]

Fixes button borders on <Header> component for ousd.com:

From: to:

See: https://github.com/OriginProtocol/origin-storybook/commit/a20275cf4da79ba727fdf38d71c1fafe661b27f5

[micahalcorn]

It looks like there are still some issues on the governance page, at least on the preview build:

Current production (master)

Preview build (this PR)

[nickick]

@micahalcorn fixed - for some odd reason, the npm package had a different build than yarn build was outputting, so had to update that.

There was also another class only used in ousd.com but referenced in origin-storybook, which would make catching the styling issues difficult in the storybook builds.

https://github.com/OriginProtocol/origin-storybook/commit/461d196d7afb9916f774285de28c4868d6a7d3ed

[Lham21]

improve the system to reduce bugs