build: move stdlib installation out of node_modules tree

[kgryte]

Checklist

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• Read and understand the Code of Conduct.
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Description

What is the purpose of this pull request?

This pull request:

• moves the stdlib installation which is used for building API reference documentation out of the node_modules tree.
• more cleanly leverages Make to avoid repeated installation when a stdlib installation already exists.
• renames environment variables.
• refactors scripts to no longer resolve a stdlib installation from the node_modules tree.
• removes the need for setting the NODE_PATH env variable when building the app.

Related Issues

Does this pull request have any related issues?

• Multiple Versions: Support for docs for multiple stdlib versions #101

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

I performed various spot checks, such as building the TypeScript documentation, versions file, and HTML fragments, and everything seemed to work as intended.

I did spot some new files when generating the TS documentation, and I am not sure if this is due to upstream changes in typedoc. This should be confirmed when we go to publish the next version of the website.

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@stdlib-js/reviewers