docs: specify Node version requirement to a minor

[DanRoscigno]

I believe the current version of Docusaurus requires node 16. With 14 I get:

import {program} from 'commander';
        ^^^^^^^
SyntaxError: The requested module 'commander' does not provide an export named 'program'
    at ModuleJob._instantiate (internal/modules/esm/module_job.js:92:21)
    at async ModuleJob.run (internal/modules/esm/module_job.js:107:20)
    at async Loader.import (internal/modules/esm/loader.js:179:24)

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[Josh-Cena]

Thanks, however, I can't reproduce this on the latest Node v14 minor:

Maybe you are using an outdated version of Node v14? We don't want to bump major versions that quickly.

[Josh-Cena]

I can confirm it works on Node v14.13 and not before. Changed it to 14.13 and let's move on.

I didn't change the version range in our package.json, because in fact, I'm not aware of any package manager that forbids installation of dependencies simply because of outdated Node version, so this is going to fail at runtime anyways.