Consolidate theme toggle styles and update repository references

- Extract duplicated theme-toggle styles into shared mixin (theme-toggle-styles)
- Remove duplicate CSS across privacy.scss, admin.scss, index.scss, and main.scss
- Apply mixin consistently to .theme-toggle, .theme-toggle-admin classes
- Update git repository references from GitHub to git.deco.sh
- Update README.md, privacy.html, and deploy script URLs
- Build optimized CSS with consolidated styles

README.md

@@ -21,7 +21,7 @@ A community-driven web application for tracking winter road conditions and icy h
 
 1. **Clone the repository:**
    ```bash
-   git clone git@github.com:deco/ice.git
+   git clone git@git.deco.sh:deco/ice.git
    cd ice
    ```
 
@@ -89,7 +89,7 @@ PORT=3000
 
 2. **Deploy your application:**
    ```bash
-   git clone git@github.com:deco/ice.git /opt/ice
+   git clone git@git.deco.sh:deco/ice.git /opt/ice
    cd /opt/ice
    npm install  # This automatically builds CSS via postinstall
    ```
@@ -149,7 +149,7 @@ MIT License - see LICENSE file for details
 ## Support
 
 This is a community safety tool. For issues or questions:
-- Create a GitHub issue
+- Create an issue on our git repository
 - Check existing documentation
 - Review security guidelines