Admin: Using a local Docusaurus package for testing

[JoelMarcey]

This is good if you want to test your latest code changes without publishing to the real npm server.

Two ways:

1. install package from the Docusaurus repo itself (note the clowntown I had to run into - we can talk about this @hramos)
2. Use verdaccio (or other local npm server)

[hramos]

Looks good. We can merge.

[hramos]

Just went through the steps and there's some minor adjustments that might make it easier to follow. It's hard to keep track of when a command has us using the path to Docusaurus itself, versus the path to the Docusaurus-using site.

/path/to/root/of/repo/where/you/want/to/run/docusaurus

to

/path/to/your_project

and

/path/to/root/of/local/docusaurus/repo/

to

/path/to/docusaurus/

I'm not convinced that my alternatives are the clearest, there's still going to be some people where it's not clear the last one points to your local Docusaurus clone.