Update documentation for site/ migration and restructuring

Documentation updates across the codebase:

Root documentation:
- README.md: Updated references from book/ to site/
- CONTRIBUTING.md: Updated build and workflow instructions
- .shared-ai-rules.md: Updated AI assistant rules for new structure

GitHub configuration:
- Issue templates updated for new module locations
- Workflow references updated from book/ to site/

docs/ updates:
- STUDENT_QUICKSTART.md: New paths and structure
- module-rules.md: Updated module development guidelines
- NBGrader documentation: Updated for module restructuring
- Archive documentation: Updated references

Module documentation:
- modules/17_memoization/README.md: Updated after reordering

All documentation now correctly references:
- site/ instead of book/
- modules/XX_name/ instead of modules/source/

.github/ISSUE_TEMPLATE/module_architecture_improvement.md

@@ -24,7 +24,7 @@ Break each complex module into **smaller, focused sub-components** while maintai
 
 **Current Structure:**
 ```
-modules/source/02_tensor/
+modules/02_tensor/
 ├── tensor_dev.py          # 1,578 lines - everything in one file
 ├── module.yaml
 └── README.md
@@ -32,7 +32,7 @@ modules/source/02_tensor/
 
 **Proposed Structure:**
 ```
-modules/source/02_tensor/
+modules/02_tensor/
 ├── parts/
 │   ├── 01_foundations.py     # Mathematical foundations & tensor theory
 │   ├── 02_creation.py        # Tensor creation & initialization
@@ -49,7 +49,7 @@ modules/source/02_tensor/
 
 **Current Structure:**
 ```
-modules/source/15_mlops/
+modules/15_mlops/
 ├── mlops_dev.py          # 1,667 lines - entire MLOps pipeline
 ├── module.yaml  
 └── README.md
@@ -57,7 +57,7 @@ modules/source/15_mlops/
 
 **Proposed Structure:**
 ```
-modules/source/15_mlops/
+modules/15_mlops/
 ├── parts/
 │   ├── 01_monitoring.py      # Model and data drift detection
 │   ├── 02_deployment.py      # Model serving & API endpoints