Resolves#3123
## What Changed
**Avatar Quality Improvements:**
- Generate avatars at 2x resolution for crisp display on high-DPI screens
- Updated Hugo imaging config with quality: 90, lanczos resampling, and picture hint
- Improved WebP compression quality across all avatar locations
**New Customization Parameters:**
- Added design.avatar.size with 5 options: small (150px), medium (200px), large (320px), xl (400px), xxl (500px)
- Added design.avatar.shape with 3 options: circle (default), square, rounded
- Sizing aligned with 2025 social media standards (LinkedIn/X: 400px, Instagram: 320px, TikTok: 200px)
**Updated Templates:**
- Enhanced resume-biography.html and resume-biography-3.html with flexible parameter system
- Updated all starter templates (academic-cv, resume, blog, link-in-bio) with example configurations
- Improved avatar CSS for dynamic sizing control
add `header.navbar.fixed_to_top` bool option
make biography blox compatible with dark section class
center views in Collections and List tpl
add features and feature_icon options to cta-image-paragraph view
George Cushen