Documentation | readme: Add build environment setup instructions for nixos (!218)

[Prashant Rahul (@prashantrahul141)]

Prashant Rahul created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/218

Project:Branches: prashantrahul141/rtems-docs:readme/build/nixos to rtems/docs/rtems-docs:main
Author:   Prashant Rahul



## Summary

This adds the steps required to setup a build environment on
[nixos](https://nixos.org/), in which docs can be built, including
single html, pdf, with images and diagrams.



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