Sync mode names with webpacks targets

[swernerx]

Webpack uses either node or web as a target for typical SSR apps. I figure it would make sense to sync the options in this plugin to use the same convention.

Naming is already hard enough and we use a ton of tools nowadays. We should align on some basics patterns to not confuse new users.

Docs: https://webpack.js.org/configuration/target/#target

BTW: I am in progress of changing this in advanced-boilerplate and prepublish-lib, too.

[ctrlplusb]

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