docs: add example files and reorganize config

- Add data/style.example.css with CSS customization guide
- Add data/scripts/example.sh as script template
- Reorganize config.example.toml with clear sections:
  - File locations box at top
  - Separate sections: General, Appearance, Providers
  - Group trigger providers vs prefix providers
  - Add inline comments for all options
- List all built-in themes in appearance section

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

data/scripts/example.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Example Owlry Script
+# Copy to: ~/.local/share/owlry/scripts/
+#
+# Scripts in the scripts directory appear in Owlry search results.
+# They are executed when selected.
+#
+# Naming convention:
+#   The filename (without extension) becomes the display name.
+#   Example: "system-update.sh" shows as "Script: system-update"
+#
+# Tips:
+#   - Make scripts executable: chmod +x script.sh
+#   - Use descriptive names for easy searching
+#   - Scripts can launch GUI apps, run terminal commands, etc.
+
+# Example: Show a notification
+notify-send "Owlry" "Hello from example script!"
+
+# Example: Open a URL
+# xdg-open "https://example.com"
+
+# Example: Run a terminal command (set terminal: true in owlry if needed)
+# echo "Script executed at $(date)"