update ARCHITECTURE.md links to project architecture section in contr…

…ibutor book (#1759)

CONTRIBUTING.md

@@ -15,7 +15,7 @@ idea of what kind of work is currently being planned or is in progress.
 
 ### Step 2: Get Familiar with the Project Architecture
 
-It's crucial to have an understanding of the [project's architecture](/ARCHITECTURE.md). Familiarize
+It's crucial to have an understanding of the [project's architecture](https://github.com/tracel-ai/burn/tree/main/contributor-book/src/project-architecture). Familiarize
 yourself with the structure of the project, the purpose of different components, and how they
 interact with each other. This will give you the context needed to make meaningful contributions.
 

README.md

@@ -591,9 +591,9 @@ any background. You can ask your questions and share what you built with the com
 
 Before contributing, please take a moment to review our
 [code of conduct](https://github.com/tracel-ai/burn/tree/main/CODE-OF-CONDUCT.md). It's also highly
-recommended to read our
-[architecture document](https://github.com/tracel-ai/burn/tree/main/ARCHITECTURE.md), which explains
-some of our architectural decisions. Refer to out [contributing guide](/CONTRIBUTING.md) for more
+recommended to read the
+[architecture overview](https://github.com/tracel-ai/burn/tree/main/contributor-book/src/project-architecture), which explains
+some of our architectural decisions. Refer to our [contributing guide](/CONTRIBUTING.md) for more
 details.
 
 ## Status