add uv installation

[antoniorodr]

Hi @kraanzu ,

I simply added instructions to install dooit and dooit-extras with uv

## UV

uv tool install --with dooit-extras dooit

[Copilot]

Pull Request Overview

This PR adds UV installation instructions for the dooit package manager. The change provides users with an alternative installation method using UV's tool command alongside the existing pip, Arch Linux, NixOS, and conda/mamba options.

• Adds UV section with installation command for dooit and dooit-extras
• Minor formatting improvements to existing sections

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[Copilot]

[nitpick] The horizontal rule formatting is inconsistent. Line 58 uses three dashes while line 121 also uses three dashes, but the original formatting used five dashes. Consider maintaining consistent formatting throughout the document.

Suggested change

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