feat: migrate to Astro 7 + Vite 8 + Tailwind 4 + Vue 3

Replaces the legacy react-static site with a modern Astro-based build.
The legacy code is preserved in _legacy-content/ for reference during
the port (TODOs 49-58 in monorepo track remaining feature parity).

## Stack
- Astro 7.1 static site framework
- Vite 8 (Astro default) with @tailwindcss/vite 4
- Tailwind 4 (CSS-first config via @theme in src/styles/global.css)
- Vue 3.5 via @astrojs/vue for interactive islands
- TypeScript 5.6 (strict)
- interscript-ts for live transliteration in the browser

## Pages
- / (home) — hero, stats, features, quick-start code samples
- /demo — live transliteration via interscript-ts
- /maps — map catalogue + explorer
- /authorities — table of authorities
- /blog — post index
- /about — mission, history, team
- /docs — getting started

## Vue island
MapExplorer.vue: dynamic interscript-ts import, real transliteration,
engine status indicator, error display. Bundled IR maps load via
import.meta.glob from public/maps/.

## Tests
15 vitest tests in test/ — site smoke tests + interscript-ts integration.

## Legacy content (preserved)
_legacy-content/posts/   — 4 blog posts (.adoc) — TODO 51
_legacy-content/docs/    — 6 docs sections (.adoc) — TODO 52
_legacy-content/map/     — legacy bundled map data

## Deploy
GitHub Pages workflow (.github/workflows/deploy.yml) on main.

Author: ronaldtse

.babelrc

@@ -1,10 +1,24 @@
-tmp
-artifacts
-node_modules
-dist
+# Build output
+dist/
+.astro/
+
+# Dependencies
+node_modules/
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
 yarn-error.log
-.idea
-public/maps/**
-!public/maps/.gitkeep
-map/*
-!map/.gitkeep
+
+# Environment
+.env
+.env.production
+
+# Editor / OS
+.DS_Store
+.idea/
+.vscode/
+*.swp
+
+# Legacy react-static (kept in _legacy-content for reference)

.gitignore

@@ -0,0 +1,48 @@
+# Interscript.org v2
+
+Astro 7 + Vite 8 + Tailwind 4 + Vue 3 islands. Uses `interscript-ts` for live map exploration.
+
+## Status
+
+🚧 **Under active development.** Replaces the legacy `interscript/interscript.github.io` react-static site once feature parity is reached.
+
+## Stack
+
+- **Astro 7** — static site framework
+- **Vite 8** — bundler
+- **Tailwind 4** — styling (CSS-first config via `@theme` in `src/styles/global.css`)
+- **Vue 3** — interactive islands (`@astrojs/vue`)
+- **TypeScript 5.6** — `astro check` for type safety
+
+## Development
+
+```bash
+npm ci
+npm run dev      # http://localhost:4321
+npm run build    # outputs to dist/
+npm run preview  # preview build locally
+```
+
+## Project structure
+
+```
+src/
+├── layouts/
+│   └── Base.astro          # HTML shell, nav, footer
+├── components/
+│   └── MapExplorer.vue     # Vue island: live transliteration
+├── pages/
+│   ├── index.astro         # Home
+│   ├── maps/index.astro    # Map explorer
+│   └── docs/index.astro    # Docs hub
+└── styles/
+    └── global.css          # Tailwind import + theme tokens
+```
+
+## Roadmap
+
+See [TODO.complete](https://github.com/interscript/interscript/tree/main/TODO.complete) for the migration checklist from the legacy site.
+
+## License
+
+BSD-2-Clause — Ribose Inc.

README.md

@@ -0,0 +1,85 @@
+= Integration with Ruby Applications
+
+Interscript can be used as a Ruby Gem library to be integrated with other Ruby
+applications.
+
+== Gemfile
+
+You need to make sure your Gemfile contains the following lines:
+
+[source,ruby]
+----
+source "https://rubygems.org"
+
+gem "interscript", "~>2.0"
+----
+
+== Requiring
+
+In your codebase, if you don't do `Bundler.require`, you will need to add the
+following line:
+
+[source,ruby]
+----
+require "interscript"
+----
+
+== Listing all available maps
+
+To list all available maps, one must execute the following code:
+
+[source,ruby]
+----
+maps = Interscript.maps
+----
+
+`maps` will be an array containing all Interscript maps by their name.
+
+== Transliterating text
+
+To transliterate test using a given map, like `bas-rus-Cyrl-Latn-2017-bss`,
+one must execute:
+
+[source,ruby]
+----
+cache = {}
+input = "Хелло"
+output = Interscript.transliterate("bas-rus-Cyrl-Latn-2017-bss",
+                                   input,
+                                   cache)
+----
+
+You should preserve the `cache` variable for performance reasons. It is optional,
+you don't need to (but should) supply it.
+
+=== Using Ruby compiler
+
+If performance is of utmost performance for your application and you want to
+sacrifice a little bit of loading time for much better performance, you can use
+`Interscript::Compiler::Ruby` instead of `Interscript::Interpreter` (which is
+used by default).
+
+[source,ruby]
+----
+require "interscript/compiler/ruby"
+
+cache = {}
+input = "Хелло"
+output = Interscript.transliterate("bas-rus-Cyrl-Latn-2017-bss",
+                                   input,
+                                   cache,
+                                   compiler: Interscript::Compiler::Ruby)
+----
+
+=== Transliterating in reverse
+
+To reverse a given string using a map with a name of a form:
+`bas-rus-Cyrl-Latn-2017-bss`, change places for Cyrl and Latn.
+
+To reverse a given string using a map with a name of a form:
+`var-swe-Latn-Latn-2021`, append `-reverse` to its name.
+
+Please note: this only works for Ruby implementation. Other implementations
+depend on the Ruby implementation for the purpose of compilation. For those,
+you need to compile the map using the Ruby implementation, but the name has
+to be given according to the above hint.