Support for customBuildPath in siteConfig.js

[bennmapes]

🚀 Feature

It would be convenient to include a customBuildPath (similar to the customDocsPath) property to the siteConfig.js file. This would allow developers to specify the build directory they want the site copied to.

Motivation

The reason for this is that sometimes docusaurs will be nested inside a project and you might want to pull out the build files to a separate directory for build assets.

Pitch

This feature would be an easy win that would prevent people having to build/run their own scripts to manage moving build assets.

[endiliey]

i prefer not having it on siteConfig as to not bloat it more. Maybe as a cli arg is better. Example: yarn build —outdir=buildPath

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