v4.12.0 does not support Node v14:

> Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (83)
> For more information on which environments are supported please see:
> https://github.com/sass/node-sass/releases/tag/v4.13.1
>     at module.exports (/Users/oliverbyford/Code/govuk-prototype-kit/node_modules/node-sass/lib/binding.js:13:13)
>     at Object.<anonymous> (/Users/oliverbyford/Code/govuk-prototype-kit/node_modules/node-sass/lib/index.js:14:35)
>     at Module._compile (internal/modules/cjs/loader.js:1200:30)
>     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1220:10)
>     at Module.load (internal/modules/cjs/loader.js:1049:32)
>     at Function.Module._load (internal/modules/cjs/loader.js:937:14)
>     at Module.require (internal/modules/cjs/loader.js:1089:19)
>     at require (internal/modules/cjs/helpers.js:73:18)
>     at Object.<anonymous> (/Users/oliverbyford/Code/govuk-prototype-kit/node_modules/gulp-sass/index.js:162:21)
>     at Module._compile (internal/modules/cjs/loader.js:1200:30)
> gulp exited with code 1

Prompt's dependency winston is causing a warning in the console:

> (node:15613) Warning: Accessing non-existent property 'padLevels' of module exports inside circular dependency

This has been raised as an issue on prompt's GitHub repo [1] but given the last release of prompt was 4 years ago, I think it makes sense to move away to an alternative that's actively maintained.

[1]: flatiron/prompt#199

This fixes a type error that's being thrown by Object.writeFileSync in Node v14:

> UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received type number (3001)
>     at Object.writeFileSync (fs.js:1380:5)
>     at /Users/oliverbyford/Code/govuk-prototype-kit/lib/utils.js:99:14
>     at processTicksAndRejections (internal/process/task_queues.js:97:5)

Prompt's dependency winston is causing a warning in the console:

> (node:15613) Warning: Accessing non-existent property 'padLevels' of module exports inside circular dependency

This has been raised as an issue on prompt's GitHub repo [1] but given the last release of prompt was 4 years ago, I think it makes sense to move away to an alternative that's actively maintained.

[1]: flatiron/prompt#199

> DeprecationWarning: Deep requiring like `const uuidv4 = require('uuid/v4');` is deprecated as of uuid@7.x. Please require the top-level module when using the Node.js CommonJS module or use ECMAScript Modules when bundling for the browser. See https://github.com/uuidjs/uuid#deep-requires-now-deprecated for more information.

Node v14 will become the active LTS release in October 2020, at which point we should recommend that users start installing it. (v12 will remain supported under LTS until 30 April 2022)

Until then, some users may only be able to install v14 as the current/latest version – for example, if a department provides Node through a managed software centre – so we should make sure it works with it.

Both places that used prompt have been updated to use inquirer instead, so prompt can now be removed.