message: doc(README): Update itk-wasm description
diff: itk-wasm
  -======
  +========
  [![Build, test](https://github.com/InsightSoftwareConsortium/itk-wasm/actions/workflows/build-test.yml/badge.svg)](https://github.com/InsightSoftwareConsortium/itk-wasm/actions/workflows/build-test.yml)
  [![CircleCI](https://img.shields.io/circleci/project/github/InsightSoftwareConsortium/itk-wasm/master.svg)](https://circleci.com/gh/InsightSoftwareConsortium/itk-wasm)
  [![DOI](https://zenodo.org/badge/45812381.svg)](https://zenodo.org/badge/latestdoi/45812381)
  -*itk-wasm* combines [Emscripten](http://emscripten.org/) and
  -[ITK](https://www.itk.org/) to enable high-performance spatial analysis in a
  -JavaScript runtime environment.
  +*itk-wasm* combines [ITK](https://www.itk.org/) and
  +[WebAssembly](http://webassembly.org/) to enable high-performance spatial
  +analysis in a web browser, Node.js, and reproducible execution across
  +programming languages and hardware architectures.
  -The project provides tools to a) build C/C++ code to JavaScript
  -([asm.js](http://asmjs.org/)) and [WebAssembly](http://webassembly.org/), b)
  -bridge local filesystems, native JavaScript data structures, and traditional
  -file formats, c) transfer data efficiently in and out of the Emscripten
  -runtime, and d) asynchronously execute processing pipelines in a background
  -thread. *itk-wasm* can be used to execute [ITK](https://www.itk.org/),
  -[VTK](https://www.vtk.org/) or arbitrary C++ codes in the browser or on a
  -workstation / server with Node.js.
  +The project provides tools to a) build C/C++ code to
  +[WebAssembly](http://webassembly.org/), b) bridge local filesystems,
  +JavaScript/Typescript data structures, and traditional file formats, c)
  +transfer data efficiently in and out of the WebAssembly runtime, and d)
  +asynchronous, parallel execution of processing pipelines in a worker pool.
  +*itk-wasm* can be used to execute [ITK](https://www.itk.org/),
  +[VTK](https://www.vtk.org/) or arbitrary C++ codes in the browser, on a
  +workstation / server with [Node.js](https://nodejs.org/), or standalone
  +execution or wrapped in [WASI](https://wasi.dev/) runtimes.
  For more information, please see [the project
  documentation](https://insightsoftwareconsortium.github.io/itk-wasm/).
  