Manual introduction improvements (#3157)

website/manual.md

@@ -2,15 +2,37 @@
 
 [toc]
 
-## Disclaimer
+## Project Status / Disclaimer
 
-A word of caution: Deno is very much under development. We encourage brave early
+**A word of caution: Deno is very much under development.**
-adopters, but expect bugs large and small. The API is subject to change without
+
-notice. [Bug reports](https://github.com/denoland/deno/issues) do help!
+We encourage brave early adopters, but expect bugs large and small. The API is
+subject to change without notice.
+[Bug reports](https://github.com/denoland/deno/issues) do help!
+
+We are
+[actively working towards 1.0](https://github.com/denoland/deno/issues/2473),
+but there is no date guarantee.
 
 ## Introduction
 
-A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio
+Deno is a JavaScript/TypeScript runtime with secure defaults and a great
+developer experience.
+
+It's built on V8, Rust, and Tokio.
+
+### Feature Highlights
+
+- Secure by default. No file, network, or environment access (unless explicitly
+  enabled).
+- Supports TypeScript out of the box.
+- Ships a single executable (`deno`).
+- Has built in utilities like a dependency inspector (`deno info`) and a code
+  formatter (`deno fmt`).
+- Has
+  [a set of reviewed (audited) standard modules](https://github.com/denoland/deno/tree/master/std)
+  that are guaranteed to work with Deno.
+- Scripts can be bundled into a single javascript file.
 
 ### Philosophy
 
@@ -23,69 +45,62 @@ program, it is runnable with nothing more than
 Deno explicitly takes on the role of both runtime and package manager. It uses a
 standard browser-compatible protocol for loading modules: URLs.
 
-Deno provides security guarantees about how programs can access your system with
+Among other things, Deno is a great replacement for utility scripts that may
-the default being the most restrictive secure sandbox.
+have been historically written with bash or python.
-
-Deno provides <a href="https://github.com/denoland/deno/tree/master/std">a set
-of reviewed (audited) standard modules</a> that are guaranteed to work with
-Deno.
 
 ### Goals
 
-- Support TypeScript out of the box.
+- Only ship a single executable (`deno`).
-
+- Provide Secure Defaults
-- Uses "ES Modules" and does not support `require()`. Like the browser, allows
+  - Unless specifically allowed, scripts can't access files, the environment, or
-  imports from URLs:
+    the network.
-
-  ```ts
-  import * as log from "https://deno.land/std/log/mod.ts";
-  ```
-
-- Remote code is fetched and cached on first execution, and never updated until
-  the code is run with the `--reload` flag. (So, this will still work on an
-  airplane. See `~/.deno/src` for details on the cache.)
-
-- File system and network access can be controlled in order to run sandboxed
-  code. Access between V8 (unprivileged) and Rust (privileged) is only done via
-  serialized messages. This makes it easy to audit. For example, to enable write
-  access use the flag `--allow-write` or for network access `--allow-net`.
-
-- Only ship a single executable.
-
-- Always dies on uncaught errors.
-
 - Browser compatible: The subset of Deno programs which are written completely
   in JavaScript and do not use the global `Deno` namespace (or feature test for
   it), ought to also be able to be run in a modern web browser without change.
+- Provide built-in tooling like unit testing, code formatting, and linting to
+  improve developer experience.
+- Does not leak V8 concepts into user land.
+- Be able to serve HTTP efficiently
 
-- [Aims to support top-level `await`.](https://github.com/denoland/deno/issues/471)
+### Comparison to Node.js
 
-- Be able to serve HTTP efficiently.
+- Deno does not use `npm`
-  ([Currently it is relatively slow.](https://deno.land/benchmarks.html#req-per-sec))
+  - It uses modules referenced as URLs or file paths
+- Deno does not use `package.json` in its module resolution algorithm.
+- All async actions in Deno return a promise. Thus Deno provides different APIs
+  than Node.
+- Deno requires explicit permissions for file, network, and environment access.
+- Deno always dies on uncaught errors.
+- Uses "ES Modules" and does not support `require()`. Third party modules are
+  imported via URLs:
+
+```javascript
+import * as log from "https://deno.land/std/log/mod.ts";
+```
+
+### Other key behaviors
+
+- Remote code is fetched and cached on first execution, and never updated until
+  the code is run with the `--reload` flag. (So, this will still work on an
+  airplane.)
+- Modules/files loaded from remote URLs are intended to be immutable and
+  cacheable.
+
+## Built-in Deno Utilities / Commands
 
 <!-- prettier-ignore-start -->
-<!-- see https://github.com/prettier/prettier/issues/3679 -->
+<!-- prettier incorrectly moves the coming soon links to new lines -->
 
-- Provide useful tooling out of the box:
+- dependency inspector (`deno info`)
-    - dependency inspector (`deno info`)
+- code formatter (`deno fmt`)
-    - code formatter (`deno fmt`),
+- bundling (`deno bundle`)
-    - bundling (`deno bundle`)
+- runtime type info (`deno types`)
-    - runtime type info (`deno types`)
+- test runner (`deno test`)
-    - test runner (`deno test`)
+- command-line debugger (`--debug`) [coming soon](https://github.com/denoland/deno/issues/1120)
-    - command-line debugger (`--debug`)
+- linter (`deno lint`) [coming soon](https://github.com/denoland/deno/issues/1880)
-      [not yet](https://github.com/denoland/deno/issues/1120)
-    - linter (`deno lint`) [not yet](https://github.com/denoland/deno/issues/1880)
 
 <!-- prettier-ignore-end -->
 
-### Non-goals
-
-- No `package.json`.
-
-- No npm.
-
-- Not explicitly compatible with Node.
-
 ## Setup
 
 ### Binary Install