docs: add taplo installation to developer setup

Add taplo-cli (TOML formatter) to the Rust installation script and update
developer documentation to explain what tools are installed.

This fixes the 'make: taplo: No such file or directory' error when running
make format commands.

- Added taplo-cli installation to install-rust.sh
- Updated getting-started.mdx to list installed tools and their purpose
- taplo-cli is required for make format to work with TOML files

Author: dannywillems

website/docs/developers/getting-started.mdx

@@ -39,10 +39,17 @@ development environment and build OpenMina from source.
 
 #### 1. Rust Toolchain
 
-OpenMina requires both stable and nightly Rust toolchains:
+OpenMina requires both stable and nightly Rust toolchains, plus additional tools
+for development:
 
 <CodeBlock language="bash">{InstallRustSh}</CodeBlock>
 
+This installs:
+
+- Rust 1.84 (stable) and nightly toolchains
+- Required components: `rustfmt`, `clippy`, `rust-src`
+- `taplo-cli`: TOML formatter required for `make format`
+
 #### 2. System Dependencies
 
 <Tabs groupId="operating-systems">

website/docs/developers/scripts/setup/install-rust.sh

@@ -16,3 +16,6 @@ rustup component add rustfmt clippy --toolchain 1.84
 
 # Add required components for nightly
 rustup component add rustfmt clippy rust-src --toolchain nightly
+
+# Install taplo (TOML formatter, required for `make format`)
+cargo install taplo-cli --locked