Add Renovate bot

[thiagolunardi]

This pull request introduces Renovate for automated dependency updates and updates the project documentation to improve clarity and modernize the presentation. The most important changes are grouped below:

Renovate integration:

• Added .github/renovate.json to configure Renovate for NuGet dependencies, including branch naming, author info, and release age rules.
• Added .github/workflows/renovate.yml to enable Renovate as a scheduled GitHub Action using a dedicated token.

Documentation improvements in README.md:

• Refreshed section headings with emojis and improved formatting for better readability and engagement. [1] [2] [3] [4]
• Updated Docker instructions to use modern docker compose commands, clarified folder names, and improved setup steps for both Docker and Visual Studio environments.
• Enhanced project description and motivation, making the purpose and comparison to EShopOnContainers clearer and more concise.

[Copilot]

Pull Request Overview

This pull request introduces automated dependency management through Renovate bot and modernizes the project documentation. The changes focus on improving maintainability and user experience.

• Adds Renovate configuration for automated NuGet dependency updates with release age controls
• Updates README.md with improved formatting, emojis, and clearer Docker setup instructions
• Modernizes Docker commands from legacy docker-compose to current docker compose syntax

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/renovate.yml	Adds GitHub Action workflow to run Renovate on a schedule
.github/renovate.json	Configures Renovate for NuGet packages with 7-day release age requirement
README.md	Modernizes documentation with emojis, improved formatting, and updated Docker commands

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