Ruby-only way to access local copy of Ruby documentation using local web server?

Is there a Ruby-only way to access a local copy of Ruby documentation 
using a local web server? I don't have Apache or any other web server 
installed.

1. I download the official Ruby documentation from 
https://ruby-doc.org/downloads/

2. I unpack the documentation as hierarchical directories of web files 
into ./ruby_2_6_core/ and ./ruby_2_6_stdlib/

3. I can point my browser to the local files ./ruby_2_6_core/index.html 
and ./ruby_2_6_stdlib/index.html which lets me browser the documentation

I would like to access this Ruby documentation via a web server, much 
the same way that I can access the documentation for installed gems via 
the command line "gem server --port 8888", which I assume uses Webrick 
under the hood.

Is there a Ruby gem or some Ruby one-liner or some simple technique that 
would allow me to do this?

Thank you!



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