docs: add uv installation instructions to Django guide

[EricWanjohiMuturi]

Description

This PR adds installation instructions using uv (by Astral) to the Django "Getting Started" guide.

As uv is rapidly becoming a preferred package manager in the Python ecosystem due to its speed and environment management capabilities, providing these alternatives alongside pip makes the documentation more modern and accessible for different developer workflows.

Changes

• Added uv commands for Django installation.
• Added uv commands for project initialization.
• Added uv commands for django-compressor installation.
• Maintained consistency with existing documentation styling (using the {{< code >}} shortcode).

Screenshots

Requirements

Project Setup

Checklist

• Verified changes locally using hugo server.
• Verified that multi-line commands render correctly.
• No changes made to package.json or package-lock.json.

##The Why
uv is a modern, fast alternative to pip and adding this option helps Python developers who prefer the astral-sh ecosystem.