feat: Add docs

docs/_config.yml

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+title: Hapax
+description: Large Language Model Infrastructure, Simplified
+remote_theme: just-the-docs/just-the-docs
+
+color_scheme: dark
+
+search_enabled: true
+
+aux_links:
+  "Hapax on GitHub":
+    - "//github.com/teilomillet/hapax"
+
+aux_links_new_tab: true

docs/index.md

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+---
+layout: home
+title: Home
+nav_order: 1
+---
+
+# Hapax Documentation
+
+Large Language Model Infrastructure, Simplified
+
+## What is Hapax?
+
+Building with Large Language Models is complex. Multiple providers, varying APIs, inconsistent performance, unpredictable costs—these challenges consume more engineering time than the actual innovation.
+
+[Get Started](getting-started){: .btn .btn-primary .fs-5 .mb-4 .mb-md-0 .mr-2 }
+[View on GitHub](https://github.com/teilomillet/hapax){: .btn .fs-5 .mb-4 .mb-md-0 }