docs: add Scarf usage-analytics pixel to docs + README

Co-Authored-By: Alex Schapiro <bearsyankees@gmail.com>

docs/advanced/configuration.mdx

@@ -3,6 +3,10 @@ title: "Configuration"
 description: "Environment variables for Strix"
 ---
 
+import { ScarfPixel } from "/snippets/scarf-pixel.mdx";
+
+<ScarfPixel />
+
 Configure Strix using environment variables or a config file.
 
 ## LLM Configuration

docs/advanced/skills.mdx

@@ -3,6 +3,10 @@ title: "Skills"
 description: "Specialized knowledge packages that enhance agent capabilities"
 ---
 
+import { ScarfPixel } from "/snippets/scarf-pixel.mdx";
+
+<ScarfPixel />
+
 Skills are structured knowledge packages that give Strix agents deep expertise in specific vulnerability types, technologies, and testing methodologies.
 
 ## The Idea