Add local documentation for tested configurations with Swann DVR8-4575 example

[Copilot]

This PR introduces a new documentation structure for tested configurations within the repository and adds the first example: Swann DVR8-4575 with PRO-1080MSB-BNC cameras.

Changes Made

New Documentation Structure

• Created docs/ directory to house tested configurations locally
• Added docs/README.md with instructions for using and contributing configurations
• Provides version-controlled backup and searchable alternative to external site

Swann DVR8-4575 Configuration

• Added comprehensive documentation in docs/swann-dvr8-4575.md
• Includes complete system specifications and hardware details
• Features annotated configuration with detailed explanations
• Provides setup instructions and performance optimization notes
• Documents RTSP URL patterns and key configuration settings

Updated README

• Modified "Tested configurations" section to reference both local docs and external site
• Maintains existing workflow while adding local searchability

Benefits

• Community Value: Users can now easily find and reference working configurations
• Version Control: Configurations are tracked in git history
• Searchability: Configurations are discoverable within the repository
• Accessibility: Provides alternative to external site dependency
• Documentation: Proper attribution and detailed setup instructions

The configuration shared by @mag911 demonstrates a working setup for Swann security camera systems with optimized settings for Raspberry Pi hardware, using TCP transport for reliability and codec copying for performance.

Fixes #1504.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• sunoo.github.io
  • Triggering command: curl -s -I REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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