Migrate documentation from Antora to Hugo

[evanchooly]

Overview

Migrate the Morphia documentation build system from Antora to Hugo, converting all AsciiDoc content to Markdown.

Infrastructure

• Custom layouts (base, single, list, header, footer, sidebar) — no theme dependency
• Shortcodes for notice/callout blocks (note, warning, tip, important)
• Self-contained CSS with responsive layout
• Navigation menu defined in data/menu.yaml
• Makefile for build, serve, and clean targets

Content Migration

Convert all pages from docs/modules/ROOT/pages/ (.adoc) to docs/content/ (.md):

• Getting started: quicktour, migrating, configuration
• Features: mapping, queries, updates, deletes, aggregations, indexing, transactions, references, lifecycle-methods, schema-validation, kotlin, text-search, sharding
• Support section

Conversion rules

AsciiDoc	Markdown/Hugo
==, === headings	##, ###
[source,java] ---- code blocks	Fenced ```java blocks
xref:page.adoc cross-references	Relative paths (/features/page/)
[NOTE], [WARNING] admonitions	{{% notice type %}} shortcodes
Javadoc links	Normalized to /javadoc/ prefix

Build System

make build  # Production build with minification
make serve  # Local dev server with live reload
make clean  # Remove generated files

Before: Antora toolchain with Ruby dependencies
After: Single Hugo binary

Cleanup

• Remove docs/antora.yml
• Update docs/pom.xml to remove Antora-specific Maven plugin configuration
• Add .gitignore for Hugo artifacts (public/, resources/_gen/)