**docs: restructure CLI usage details and update scripts for clarity**

- **CLI Documentation Updates**:
  - Updated `README.md` to reflect the separation of CLI functionality into a new package: `@soulcraft/brainy-cli`.
  - Replaced inline CLI imports with instructions for installing and using `@soulcraft/brainy-cli`.
  - Clarified notes on keeping the main package lightweight by decoupling CLI functionality.

- **Script and Command Adjustments**:
  - Modified build instructions in `README.demo.md` to use `npm run build && npm run build:browser`.
  - Updated demo scripts in `package.json` to point to `/demo/index.html` instead of `/index.html`.
  - Revised style-check script in `CONTRIBUTING.md` to use `npm run check:style`.

- **Issues and Contribution Guidelines**:
  - Improved issue reporting section in `DEVELOPERS.md` with clearer guidelines and examples for bug and feature requests.

**Purpose**: These changes enhance documentation accuracy, streamline developer guidance, and ensure commands/scripts are up-to-date with current usage patterns.

DEVELOPERS.md

@@ -168,11 +168,7 @@ These optimizations are particularly beneficial for:
 
 ## Reporting Issues
 
-We use GitHub issues to track bugs and feature requests. Please use the provided issue templates when creating a new
-issue:
-
-- [Bug Report Template](.github/ISSUE_TEMPLATE/bug_report.md)
-- [Feature Request Template](.github/ISSUE_TEMPLATE/feature_request.md)
+We use GitHub issues to track bugs and feature requests. When creating a new issue, please provide detailed information including steps to reproduce, expected behavior, and actual behavior for bugs, or clear use cases and benefits for feature requests.
 
 ## Code Style Guidelines