docs: Rebrand OptimizR to Optimiz-rs throughout documentation

Updated Branding in ReadTheDocs:
- ✅ All 'OptimizR' → 'Optimiz-rs' (17 files)
- ✅ Project name in conf.py
- ✅ HTML title and short title
- ✅ All algorithm documentation
- ✅ Getting started guide
- ✅ Installation guide
- ✅ Theory/mathematical foundations
- ✅ Archive documentation

Documentation now consistently uses the new 'optimiz-rs' branding that
matches both PyPI and crates.io package names.

Note: Python module name 'optimizr' in import statements intentionally
unchanged (that's the actual module name).

docs/source/getting-started.md

@@ -12,7 +12,7 @@ pip install -r docs/requirements.txt
 pip install maturin numpy
 ```
 
-## 2. Build and install OptimizR locally
+## 2. Build and install Optimiz-rs locally
 
 ```bash
 pip install .
@@ -26,7 +26,7 @@ maturin develop --release
 python - <<'PY'
 import optimizr
 from optimizr import differential_evolution, HMM
-print("OptimizR version:", optimizr.__version__)
+print("Optimiz-rs version:", optimizr.__version__)
 
 # Simple objective
 f = lambda x: sum(v * v for v in x)