Essentials: npm8 support for sb init

[shilman]

@shilman Is there a proposed solution for NPM 8? I've pulled all storybook dependencies into a separate NPM project and listed @storybook/addon-docs as a dependencies:

    "@storybook/addon-actions": "^6.3.6",
    "@storybook/addon-docs": "^6.3.12",
    "@storybook/addon-essentials": "^6.3.6",
    "@storybook/addon-links": "^6.3.6",
    "@storybook/builder-webpack5": "^6.3.12",
    "@storybook/cli": "^6.3.6",
    "@storybook/components": "^6.3.0",
    "@storybook/core-events": "^6.3.0",
    "@storybook/manager-webpack5": "^6.3.12",
    "@storybook/react": "^6.3.6",
    "@storybook/theming": "^6.3.0",

However, NPM 8 installs this in the packages node_modules. i.e. <project_root>/node_modules/@my_package/node_modules/@storybook/addon-docs and Webpack can't find it.

On the other hand, if I install @storybook/addon-docs in my project root, it resolves and Webpack builds correctly.

Originally posted by @josh-biddick in #14429 (comment)

[shilman]

We’re cleaning house! Storybook has changed a lot since this issue was created and we don’t know if it’s still valid. Please open a new issue referencing this one if:

• this is still a problem in SB 7.x
• you can provide a consistent reproduction in 7.x (at https://storybook.new/ or per repro docs).