Cleanup yoastseo package leftovers

[igorschoester]

Explanation

The yoastseo package went through some changes like moving to the monorepo and being built with babel.
But some of the things no longer used are still there...

• Looking at grunt/config/aliases.yaml:
  • build - I don't think this is used anymore, please verify. If not then the called tasks can also be removed:
    • build:css
    • build:translations
    • default -> the build step
  • build:browserified

This leads to more adjustments of tasks, please follow the threads. For example the css entry can be removed from the grunt/config/copy.js file if the build:css is no longer there.
But also they use packages that can also be removed. For example the grunt-browserified.

• There is a css folder, which I doubt is used anywhere. But if it is, it should probably not be used. So that means the whole CSS chain can go.

• The examples/browserified can go (the grunt task above and packages too of course).

• Most likely the languages folder can go too. To my knowledge we build the translations in wordpress-seo. And there is no need to have them in this package.

• templates folder should no longer be used I reckon. Perhaps it still is, but that would then be because of other technical debt. Please find out and follow the chain.

• start script in the package.json can be removed.

• browserify entry in the package.json can be removed.

• Not sure if we use istanbul still. Maybe in Travis? What is it? See: https://istanbul.js.org/

• inch.json - No idea, most likely not. What is it? See: https://inch-ci.org/help

• The dependencies probably have quite a lot of things that are no longer used.

Technical decisions

Feedback?