docs: update pdf preview link

Author: solygambas

README.md

@@ -18,7 +18,7 @@ Inside the PDF, you'll find:
 
 This guide isn't just about tweaking projects; it's about building momentum, mastering fundamentals, and challenging yourself to explore, break, and rebuild.
 
-[**Preview the Companion Guide (PDF)**](https://www.onbusinessplan.com/pdfs/100%20projects%20-%20Companion%20Guide.pdf)
+[**Preview the Companion Guide (PDF)**](https://www.onbusinessplan.com/pdfs/100-projects-in-100-days.pdf)
 
 > **Want the full guide?**  
 > Continue your journey with [**_Volume 1: Essentials (Days 1–50)_ on Amazon**](https://amzn.to/4g01whb) — unlock 40 more hands-on projects to sharpen your skills and build your portfolio.
@@ -137,7 +137,7 @@ Explore each project individually and view live demos to see them in action:
 | 101 | [Cascade Layers](101-cascade%20layers)                                 | [Live Demo](https://codepen.io/solygambas/full/poYaZmv)  |
 | 102 | [Container Queries](102-container%20queries)                           | [Live Demo](https://codepen.io/solygambas/full/abMqPNy)  |
 
-> **Ready to master all 102 projects?** Don't just build them—transform them into portfolio showpieces with our [**Ultimate Companion Guide**](https://www.onbusinessplan.com/pdfs/100%20projects%20-%20Companion%20Guide.pdf)!
+> **Ready to master all 102 projects?** Don't just build them—transform them into portfolio showpieces with our [**Ultimate Companion Guide**](https://www.onbusinessplan.com/pdfs/100-projects-in-100-days.pdf)!
 
 ## Get Inspired