Add nightly note

Author: coltonhurst

docs/getting-started/clients/desktop/index.mdx

@@ -18,20 +18,22 @@ These are available as additional dependencies in the Visual Studio Installer.
 
 - Visual C++ Build tools
 - [Rust](https://www.rust-lang.org/tools/install)
-- Cargo binaries for pre-commit hooks
-  - [cargo-sort](https://crates.io/crates/cargo-sort)
-  - [cargo-udeps](https://crates.io/crates/cargo-udeps)
-  - [cargo-deny](https://crates.io/crates/cargo-deny)
+  1. The nightly toolchain: `rustup toolchain install nightly`
+  2. Cargo binaries for pre-commit hooks
+     - [cargo-sort](https://crates.io/crates/cargo-sort)
+     - [cargo-udeps](https://crates.io/crates/cargo-udeps)
+     - [cargo-deny](https://crates.io/crates/cargo-deny)
 
 </TabItem>
 <TabItem value="mac" label="macOS">
 
 - Xcode Command Line Tools
 - [Rust](https://www.rust-lang.org/tools/install)
-- Cargo binaries for pre-commit hooks
-  - [cargo-sort](https://crates.io/crates/cargo-sort)
-  - [cargo-udeps](https://crates.io/crates/cargo-udeps)
-  - [cargo-deny](https://crates.io/crates/cargo-deny)
+  1. The nightly toolchain: `rustup toolchain install nightly`
+  2. Cargo binaries for pre-commit hooks
+     - [cargo-sort](https://crates.io/crates/cargo-sort)
+     - [cargo-udeps](https://crates.io/crates/cargo-udeps)
+     - [cargo-deny](https://crates.io/crates/cargo-deny)
 
 </TabItem>
 <TabItem value="lin" label="Linux">
@@ -41,10 +43,11 @@ These are available as additional dependencies in the Visual Studio Installer.
   - `libsecret-1-dev`
   - `libglib2.0-dev`
 - [Rust](https://www.rust-lang.org/tools/install)
-- Cargo binaries for pre-commit hooks
-  - [cargo-sort](https://crates.io/crates/cargo-sort)
-  - [cargo-udeps](https://crates.io/crates/cargo-udeps)
-  - [cargo-deny](https://crates.io/crates/cargo-deny)
+  1. The nightly toolchain: `rustup toolchain install nightly`
+  2. Cargo binaries for pre-commit hooks
+     - [cargo-sort](https://crates.io/crates/cargo-sort)
+     - [cargo-udeps](https://crates.io/crates/cargo-udeps)
+     - [cargo-deny](https://crates.io/crates/cargo-deny)
 
 </TabItem>
 </Tabs>