feat: add MkDocs Material site and publish docs + CI reports to GitHub Pages

docs/index.md

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+# Radixor
+
+**Radixor** is a high-performance, multi-language stemmer for Java, designed for production-grade search and text-processing systems.
+
+It modernizes the proven Egothor patch-command trie approach and delivers:
+
+- **Fast runtime stemming** with compact lookup structures
+- **Multi-language adaptability** through dictionary-driven compilation
+- **Deterministic behavior** suitable for reproducible processing pipelines
+- **Flexible integration paths**, including CLI-based and programmatic workflows
+- **Operational transparency** via continuously published quality and benchmark reports
+
+Radixor is built for teams that need consistent stemming quality at scale without sacrificing maintainability or deployment efficiency.
+
+## Start here
+
+- Read [Quick Start](quick-start.md) for immediate implementation guidance.
+- Use [Programmatic Usage](programmatic-usage.md) for application integration patterns.
+- Review [Benchmarking](benchmarking.md) for reproducible performance methodology.
+- Open [CI Reports](reports.md) to inspect published build artifacts and quality metrics.