docs: Add Nix and Flakes

Q	A
Documentation	yes
Bugfix	yes/no
BC Break	yes/no
New Feature	yes/no
RFC	yes/no
QA	yes/no

Walkthrough

The updates to the documentation significantly improve the onboarding experience for developers by detailing the integration of the Nix package manager. A new section provides clear instructions on initiating the development environment with the command nix develop and suggests using direnv for automatic configuration. Installation guides for both Linux and macOS are included, along with an explanation of Nix's advantages over traditional package managers.

Changes

Files	Change Summary
README.md	Added a section on integrating the Nix package manager, including setup instructions, installation guide for Linux and macOS, and advantages of using Nix.

Poem

In the code garden, hops a little sprite,
With Nix to manage, everything feels right.
nix develop, oh what joy to see!
A world of tools, all set up with glee.
With direnv’s magic, we enter and play,
Welcome, dear developers, come join the fray! 🐰✨

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blackfyre / wga