Ensure people who hit /linux directly have the right instructions (#13959)

Conrad Irwin created 

Release Notes:

- N/A

Change summary

README.md                   |  5 +++--
docs/src/getting-started.md |  7 +------
docs/src/linux.md           | 21 +++++++++++++++++++--
3 files changed, 23 insertions(+), 10 deletions(-)

Detailed changes

README.md 🔗 

@@ -6,11 +6,10 @@ Welcome to Zed, a high-performance, multiplayer code editor from the creators of
 
 ## Installation
 
-You can [download](https://zed.dev/download) Zed today for macOS (v10.15+).
+You can [download](https://zed.dev/download) Zed today for macOS (v10.15+) and most Linux installations.
 
 Support for additional platforms is on our [roadmap](https://zed.dev/roadmap):
 
-- Linux ([tracking issue](https://github.com/zed-industries/zed/issues/7015))
 - Windows ([tracking issue](https://github.com/zed-industries/zed/issues/5394))
 - Web ([tracking issue](https://github.com/zed-industries/zed/issues/5396))
 
@@ -26,6 +25,8 @@ Alternatively, to install the Preview release:
 brew install --cask zed@preview
 ```
 
+For Linux users, [other installation options are available](https://zed.dev/docs/linux#other-ways-to-install-zed-on-linux) depending on your package manager.
+
 ## Developing Zed
 
 - [Building Zed for macOS](./docs/src/development/macos.md)

docs/src/getting-started.md 🔗 

@@ -22,12 +22,7 @@ If you'd like to help us test our new features, you can also install our preview
 curl https://zed.dev/install.sh | ZED_CHANNEL=preview sh
 ```
 
-This script supports `x86_64` and `AArch64`, as well as common Linux distributions: Ubuntu, Arch, Debian, RedHat, CentOS, and Fedora.
-
-The install script does not work on systems that:
-* have no system-wide glibc (for example on NixOS or Alpine)
-* have a glibc older than version 2.29 (for example Amazon Linux 2 or Ubuntu 18 and earlier)
-* use an architecture other than 64-bit Intel or 64-bit ARM (for example a 32-bit or RISC-V machine)
+This script supports `x86_64` and `AArch64`, as well as common Linux distributions: Ubuntu, Arch, Debian, RedHat, CentOS, Fedora, and more.
 
 If this script is insufficient for your use case or you run into problems running Zed, please see our [linux-specific documentation](./linux.md)

docs/src/linux.md 🔗 

@@ -1,6 +1,23 @@
-# Other ways to install Zed on Linux
+# Getting started
+
+For most people we recommend using the script on the [download](/download) page to install Zed:
+
+```sh
+curl https://zed.dev/install.sh | sh
+```
+
+We also offer a preview build of Zed which receives updates about a week ahead of stable. You can install it with:
 
-## Installing from source
+```sh
+curl https://zed.dev/install.sh | ZED_CHANNEL=preview sh
+```
+
+The install script does not work on systems that:
+* have no system-wide glibc (for example on NixOS or Alpine)
+* have a glibc older than version 2.29 (for example Amazon Linux 2 or Ubuntu 18 and earlier)
+* use an architecture other than 64-bit Intel or 64-bit ARM (for example a 32-bit or RISC-V machine)
+
+# Other ways to install Zed on Linux
 
 Zed is open source, and [you can install from source](./development/linux.md).