Merge #1691: docs: Add build-essential to Prerequisites (#1595)

92929ba docs(#1595): Add build-essential to Prerequisites (Jose Celano)

Pull request description:

  ## Description

  Resolves #1595

  ### Changes

  Added `build-essential` package to the Prerequisites section of the documentation. This package is required to provide the C compiler (`cc`) which is essential for compiling Rust code and its dependencies.

  ### Why

  When building on a fresh Ubuntu 24 machine, users encountered the error:
  ```
  error: linker `cc` not found
  ```

  This error occurs because `build-essential` (which includes the C compiler) was not installed. The documentation did not mention this requirement, so users had to discover it through trial and error.

  ### What Changed

  - Added a new prerequisite step to install `build-essential` before other dependencies
  - This ensures users have the necessary build tools before attempting to compile the project

  ### Documentation

  The change is reflected in the Rust documentation under the "Prerequisites" section which is published to [docs.rs](https://docs.rs/torrust-tracker/latest/torrust_tracker/#prerequisites).

ACKs for top commit:
  josecelano:
    ACK 92929ba

Tree-SHA512: 8c0605623a8d92b1208252a41d5b9a4df5cdfafb7f3efaeb9658aed3958c0a34538298f2f4908a7efd4858d830ab0d6760f6d63a9bafe0ccad3cef5646a20d6b

Author: josecelano

src/lib.rs

@@ -88,6 +88,12 @@
 //!
 //! The tracker has some system dependencies:
 //!
+//! First, you need to install the build tools:
+//!
+//! ```text
+//! sudo apt-get install build-essential
+//! ```
+//!
 //! Since we are using the `openssl` crate with the [vendored feature](https://docs.rs/openssl/latest/openssl/#vendored),
 //! enabled, you will need to install the following dependencies:
 //!