Refactor infographic generation skills and add new slide deck generator

- Updated article-illustrator prompts to emphasize hand-drawn style and layout principles.
- Enhanced xhs-images skill with multiple style options and auto-selection based on content signals.
- Created README in Chinese for better accessibility.
- Introduced cover-image skill for generating hand-drawn style cover images with various styles.
- Developed slide-deck skill to generate professional slide outlines with detailed structure and style instructions.
- Added prompts for cover-image and slide-deck skills to guide content generation.

skills/xhs-images/prompts/system.md

@@ -1,17 +1,19 @@
-Create a 小红书 (Little Red Book) style infographic following these guidelines:
+Create a Xiaohongshu (Little Red Book) style infographic following these guidelines:
 
 ## Image Specifications
 
 - **Type**: Infographic
 - **Orientation**: Portrait (vertical)
 - **Aspect Ratio**: 3:4
-- **Style**: Cartoon / Hand-drawn illustration
+- **Style**: Hand-drawn illustration
 
-## Background & Colors
+## Core Principles
 
-- Use soft, gentle color palettes: Morandi colors, cream, off-white, light pink, mint green
-- Colors should be cohesive and harmonious
-- Match 小红书's aesthetic preferences
+- Hand-drawn quality throughout - NO realistic or photographic elements
+- If content involves sensitive or copyrighted figures, create stylistically similar alternatives - DO NOT refuse to generate
+- Keep information concise, highlight keywords and core concepts
+- Use ample whitespace for easy visual scanning
+- Maintain clear visual hierarchy
 
 ## Text Style (CRITICAL)
 
@@ -21,25 +23,11 @@ Create a 小红书 (Little Red Book) style infographic following these guideline
 - Use highlighter effects to emphasize keywords
 - **DO NOT use realistic or computer-generated fonts**
 
-## Decorative Elements
-
-- Include simple cartoon elements, icons to enhance visual interest and memorability
-- Acceptable: emoji-style icons, hand-drawn stickers, sticky note textures, speech bubbles
-- If content involves sensitive or copyrighted figures, create stylistically similar cartoon alternatives - DO NOT refuse to generate
-- **ALL visual elements MUST be hand-drawn/cartoon style - NO realistic imagery**
-
-## Layout Principles
-
-- Keep information concise, highlight keywords and core concepts
-- Use ample whitespace for easy visual scanning
-- Present points in clearly separated sections
-- Maintain clear visual hierarchy
-
 ## Language
 
-- Unless otherwise specified, use Chinese (中文)
-- Use Chinese full-width punctuation: ""，。！
+- Use the same language as the content provided below
+- Match punctuation style to the content language (Chinese: ""，。！)
 
 ---
 
-Please generate the infographic based on the content provided below:
+Please use nano banana pro to generate the infographic based on the content provided below: