Document that colors_custom.css files are excluded from version control

Co-authored-by: jmiller-moko <230051081+jmiller-moko@users.noreply.github.com>

CHANGELOG.md

@@ -25,9 +25,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **README**: Updated title to "README - MokoCassiopeia (VERSION: 03.06.03)"
 - **README**: Fixed custom color variables instructions with correct file paths
 - **README**: Updated example CSS variables to use actual template variable names (e.g., `--color-link` instead of `--cassiopeia-color-link`)
+- **README**: Added note that custom color files are excluded from version control via `.gitignore`
 - **TOC CSS**: Updated bootstrap-toc.css to use template color variables for proper theme integration
 - **Version**: Updated version to 03.06.03 across all files
 
+### Documentation
+- Clarified that `colors_custom.css` files are gitignored to prevent fork-specific customizations from being committed
+
 ## [03.06.02] - 2026-01-30
 
 ### Major Rebrand

README.md

@@ -211,6 +211,8 @@ MokoCassiopeia supports custom color schemes:
 3. Define CSS variables (reference `colors_standard.css` for structure)
 4. Select "Custom" palette in template settings
 
+**Note:** Custom color files are excluded from version control (`.gitignore`) to prevent fork-specific customizations from being committed.
+
 **Example CSS Variables:**
 
 ```css