Replace references to release branch with master

[gantoine]

No description provided.

[Copilot]

Pull Request Overview

This PR updates documentation references from the old "release" branch to the "master" branch across multiple documentation files. The changes ensure that all GitHub links point to the correct branch for example files and resources.

• Updates GitHub URLs from /blob/release/ to /blob/master/ in documentation files
• Affects links to example configuration files, docker-compose templates, and other project resources
• Maintains consistency across all documentation references

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/System-Setup/Unraid-Setup-Guide.md	Updates docker-compose example file references to master branch
docs/System-Setup/Unraid-Compose-Setup.md	Updates docker-compose example file reference to master branch
docs/System-Setup/TrueNAS-Setup-Guide.md	Updates README reference to master branch
docs/Platforms-and-Players/Custom-Platforms.md	Updates platform icons and assets references to master branch
docs/Getting-Started/Quick-Start-Guide.md	Updates docker-compose example file reference to master branch
docs/Getting-Started/Folder-Structure.md	Updates config example file reference to master branch
docs/Getting-Started/Configuration-File.md	Updates multiple config example file references to master branch

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