readme: tidy up the front matter a little

Summary: Just a small rework of the very top-level frontmatter. Now:

- Uses `<div>` to center things a little
- Adds top-level links to the new homepage, installation guide, and tutorial
- Reworks the disclaimer and 'Introduction' section. After all, a README should
first say what the project is! I think this reads much better.

Signed-off-by: Austin Seipp <[email protected]>
Change-Id: I2d92a21650afec0640add3741d4f20c5

README.md

@@ -1,23 +1,25 @@
-# Jujutsu VCS
+<div class="title-block" style="text-align: center;" align="center">
 
-![](https://img.shields.io/github/license/martinvonz/jj) ![](https://img.shields.io/github/v/release/martinvonz/jj) ![](https://img.shields.io/github/release-date/martinvonz/jj) ![](https://img.shields.io/crates/v/jj-cli)
+# Jujutsu—a version control system
+
+![](https://img.shields.io/github/license/martinvonz/jj)
+![](https://img.shields.io/github/v/release/martinvonz/jj)
+![](https://img.shields.io/github/release-date/martinvonz/jj)
+![](https://img.shields.io/crates/v/jj-cli)
 <br/>
-![](https://github.com/martinvonz/jj/workflows/build/badge.svg) ![](https://img.shields.io/codefactor/grade/github/martinvonz/jj/main) ![](https://img.shields.io/librariesio/github/martinvonz/jj)
+![](https://github.com/martinvonz/jj/workflows/build/badge.svg)
+![](https://img.shields.io/codefactor/grade/github/martinvonz/jj/main)
+![](https://img.shields.io/librariesio/github/martinvonz/jj)
 
-- [Disclaimer](#disclaimer)
-- [Introduction](#introduction)
-- [Getting started](#getting-started)
-- [Status](#status)
-- [Related work](#related-work)
+**[Homepage] &nbsp;&nbsp;&bull;&nbsp;&nbsp;**
+**[Installation] &nbsp;&nbsp;&bull;&nbsp;&nbsp;**
+**[Getting Started Tutorial]**
 
-## Disclaimer
+[Homepage]: https://martinvonz.github.io/jj
+[Installation]: https://martinvonz.github.io/jj/latest/install-and-setup.html
+[Getting Started Tutorial]: https://martinvonz.github.io/jj/latest/tutorial.html
 
-This is not a Google product. It is an experimental version-control system
-(VCS). I (Martin von Zweigbergk <[email protected]>) started it as a hobby
-project in late 2019. That said, this is now my full-time project at Google. My
-presentation from Git Merge 2022 has information about Google's plans. See the
-[slides](https://docs.google.com/presentation/d/1F8j9_UOOSGUN9MvHxPZX_L4bQ9NMcYOp1isn17kTC_M/view)
-or the [recording](https://www.youtube.com/watch?v=bx_LGilOuE4).
+</div>
 
 ## Introduction
 
@@ -41,9 +43,19 @@ The command-line tool is called `jj` for now because it's easy to type and easy
 to replace (rare in English). The project is called "Jujutsu" because it matches
 "jj".
 
-If you have any questions, please join us on Discord
+Jujutsu is relatively young, with lots of work to still be done. If you have any
+questions, or want to talk about future plans, please join us on Discord
 [![Discord](https://img.shields.io/discord/968932220549103686.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/dkmfj3aGQN)
-or start a [GitHub Discussion](https://github.com/martinvonz/jj/discussions).
+or start a [GitHub Discussion](https://github.com/martinvonz/jj/discussions); the
+developers monitor both channels.
+
+> 🚧 **NOTE** 🚧: This is not a Google product. It is an experimental
+> version-control system (VCS). I (Martin von Zweigbergk
+> <[email protected]>) started it as a hobby project in late 2019. That
+> said, this is now my full-time project at Google. My presentation from Git
+> Merge 2022 has information about Google's plans. See the
+> [slides](https://docs.google.com/presentation/d/1F8j9_UOOSGUN9MvHxPZX_L4bQ9NMcYOp1isn17kTC_M/view)
+> or the [recording](https://www.youtube.com/watch?v=bx_LGilOuE4).
 
 ## Getting started