yarn workspace

[azu]

We should use yarn workspace instead of strange monorepo.

• https://github.com/textlint/textlint-app/tree/master/packages

textlint-app/package.json

Lines 149 to 151 in f22fdb2

	"textlint-app-locator": "file:packages/textlint-app-locator",
	"textlint-message-to-codemirror": "^1.0.0",
	"textlint-server-package-manager": "file:packages/textlint-server-package-manager"

Also, app it-self should be a pacakge.