docs(README): Update README to include more recent links and use external docs (#21341)

Update the README to use current links, and link to appropriate external
documentation for most information.

README.md

@@ -6,26 +6,21 @@
 
 <img align="right" src="https://deno.land/logo.svg" height="150px" alt="the deno mascot dinosaur standing in the rain">
 
-[Deno](https://deno.com/runtime) is a _simple_, _modern_ and _secure_ runtime
-for **JavaScript** and **TypeScript** that uses V8 and is built in Rust.
+[Deno](https://www.deno.com)
+([/ˈdiːnoʊ/](http://ipa-reader.xyz/?text=%CB%88di%CB%90no%CA%8A), pronounced
+`dee-no`) is a JavaScript, TypeScript, and WebAssembly runtime with secure
+defaults and a great developer experience. It's built on [V8](https://v8.dev/),
+[Rust](https://www.rust-lang.org/), and [Tokio](https://tokio.rs/).
 
-### Features
+Learn more about the Deno runtime
+[in the documentation](https://docs.deno.com/runtime/manual).
 
-- [Secure by default.](https://deno.land/manual/basics/permissions) No file,
-  network, or environment access, unless explicitly enabled.
-- Provides
-  [web platform functionality and APIs](https://deno.land/manual/runtime/web_platform_apis),
-  e.g. using ES modules, web workers, and `fetch()`.
-- Supports
-  [TypeScript out of the box](https://deno.land/manual/advanced/typescript).
-- Ships only a single executable file.
-- [Built-in tooling](https://deno.land/manual/tools#built-in-tooling) including
-  `deno test`, `deno fmt`, `deno bench`, and more.
-- Includes [a set of reviewed standard modules](https://deno.land/std/)
-  guaranteed to work with Deno.
-- [Supports npm.](https://deno.land/manual/node)
+## Installation
 
-### Install
+Install the Deno runtime on your system using one of the commands below. Note
+that there are a number of ways to install Deno - a comprehensive list of
+installation options can be found
+[here](https://docs.deno.com/runtime/manual/getting_started/installation).
 
 Shell (Mac, Linux):
 
@@ -51,64 +46,49 @@ brew install deno
 choco install deno
 ```
 
-[Scoop](https://scoop.sh/) (Windows):
+### Build and install from source
 
-```powershell
-scoop install deno
-```
+Complete instructions for building Deno from source can be found in the manual
+[here](https://docs.deno.com/runtime/manual/references/contributing/building_from_source).
 
-Build and install from source using [Cargo](https://crates.io/crates/deno):
+## Your first Deno program
 
-```sh
-# Install build dependencies
-apt install -y cmake protobuf-compiler # Linux
-brew install cmake protobuf # macOS
-
-# Build and install Deno
-cargo install deno --locked
-```
-
-See
-[deno_install](https://github.com/denoland/deno_install/blob/master/README.md)
-and [releases](https://github.com/denoland/deno/releases) for other options.
-
-### Getting Started
-
-Try [running a simple program](https://examples.deno.land/hello-world):
-
-```sh
-deno run https://examples.deno.land/hello-world.ts
-```
-
-Or [setup a simple HTTP server](https://examples.deno.land/http-server):
+Deno can be used for many different applications, but is most commonly used to
+build web servers. Create a file called `server.ts` and include the following
+TypeScript code:
 
 ```ts
-Deno.serve((_req) => new Response("Hello, World!"));
+Deno.serve((_req: Request) => {
+  return new Response("Hello, world!");
+});
 ```
 
-[More Examples](https://examples.deno.land)
+Run your server with the following command:
 
-### Additional Resources
+```sh
+deno run --allow-net server.ts
+```
 
-- **[The Deno Manual](https://deno.land/manual)** is a great starting point for
-  [additional examples](https://deno.land/manual/examples),
-  [setting up your environment](https://deno.land/manual/getting_started/setup_your_environment),
-  [using npm](https://deno.land/manual/node), and more.
-- **[Runtime API reference](https://deno.land/api)** documents all APIs built
-  into Deno CLI.
-- **[Deno Standard Modules](https://deno.land/std)** do not have external
-  dependencies and are reviewed by the Deno core team.
-- **[deno.land/x](https://deno.land/x)** is the registry for third party
-  modules.
-- **[Blog](https://deno.com/blog)** is where the Deno team shares important
-  product updates and “how to”s about solving technical problems.
+This should start a local web server on
+[http://localhost:8000](http://localhost:8000).
 
-### Contributing
+Learm more about writing and running Deno programs
+[in the docs](https://docs.deno.com/runtime/manual).
 
-We appreciate your help!
+## Additional resources
 
-To contribute, please read our
-[contributing instructions](https://deno.land/manual/references/contributing/).
+- **[Deno Docs](https://docs.deno.com)**: official guides and reference docs for
+  the Deno runtime, [Deno Deploy](https://deno.com/deploy), and beyond.
+- **[Deno Standard Library](https://deno.land/std)**: officially supported
+  common utilities for Deno programs.
+- **[deno.land/x](https://deno.land/x)**: registry for third-party Deno modules.
+- **[Developer Blog](https://deno.com/blog)**: Product updates, tutorials, and
+  more from the Deno team.
+
+## Contributing
+
+We appreciate your help! To contribute, please read our
+[contributing instructions](https://docs.deno.com/runtime/manual/references/contributing/).
 
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