docs: reorganize installation instructions

Author: axkoro

readme.md

@@ -21,14 +21,17 @@ gitnr search
 ## Table of Contents
 
 - [Installation](#install--update)
-    - [Linux & Mac](#linux--mac)
-    - [Windows](#windows)
-    - [Cargo](#cargo)
-    - [Cargo Binstall](#cargo-binstall)
-    - [Binary Download](#binary-download)
-    - [NetBSD](#NetBSD)
-    - [Homebrew](#homebrew)
-    - [From Source](#from-source)
+    - [Package Managers](#package-managers)
+        - [Homebrew (macOS / Linux)](#homebrew-macos--linux)
+        - [Cargo](#cargo)
+        - [Cargo Binstall](#cargo-binstall)
+        - [NetBSD](#netbsd)
+    - [Install Scripts](#install-scripts)
+        - [Linux & macOS](#linux--macos)
+        - [Windows](#windows)
+    - [Manual Install](#manual-install)
+        - [Binary Download](#binary-download)
+        - [From Source](#from-source)
 - [Usage](#usage)
     - [Create](#create)
     - [Search](#search)
@@ -37,70 +40,77 @@ gitnr search
 
 ## Install & Update
 
-### Linux & Mac
+### Package Managers
 
-Run any of the commands below in your terminal to get the latest version of `gitnr`.
+#### Homebrew (macOS / Linux)
 
-**Install system-wide**
-```sh
-curl -s https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.sh | sudo bash -s
-```
+Install the latest version using Homebrew with the command below.
 
-**Install for current user**
 ```sh
-curl -s https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.sh | bash -s -- -u
+brew install gitnr
 ```
 
-_On Linux this defaults to `$HOME/.local/bin` and on macOS to `$HOME/bin`. The script will fail if the directory doesn't exist or is not in your system path._
+#### Cargo
+
+Install and compile the latest version from crates.io with the command below.
 
-**Install in specific directory**
 ```sh
-curl -s https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.sh | bash -s -- -d <dir>
+cargo install gitnr
 ```
 
-### Windows
+#### Cargo Binstall
 
-Run the command below in a PowerShell terminal to install the latest version of `gitnr`.
+Install the binary directly using `cargo-binstall`.
 
-```powershell
-Set-ExecutionPolicy Unrestricted -Scope Process; iex (iwr "https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.ps1").Content
+```sh
+cargo-binstall gitnr
 ```
 
-### Cargo
-
-Install and compile the latest version from crates.io with the command below.
+#### NetBSD
 
+On NetBSD a pre-compiled binary is available from the official repositories. To install it, simply run:
 ```sh
-cargo install gitnr
+pkgin install gitnr
 ```
 
-### Cargo Binstall
+### Install Scripts
 
-Install the binary directly using `cargo-binstall`.
+#### Linux & macOS
 
+Run any of the commands below in your terminal to get the latest version of `gitnr`.
+
+**Install system-wide**
 ```sh
-cargo-binstall gitnr
+curl -s https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.sh | sudo bash -s
 ```
 
-### Binary Download
-
-See the [releases page](https://github.com/reemus-dev/gitnr/releases) to download a binary and then add it to a directory in your system path.
+**Install for current user**
+```sh
+curl -s https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.sh | bash -s -- -u
+```
 
-### NetBSD
+_On Linux this defaults to `$HOME/.local/bin` and on macOS to `$HOME/bin`. The script will fail if the directory doesn't exist or is not in your system path._
 
-On NetBSD a pre-compiled binary is available from the official repositories. To install it, simply run:
+**Install in specific directory**
 ```sh
-pkgin install gitnr
+curl -s https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.sh | bash -s -- -d <dir>
 ```
 
-### Homebrew
+#### Windows
 
-You can also install the latest version using Homebrew:
-```sh
-brew install gitnr
+Run the command below in a PowerShell terminal to install the latest version of `gitnr`.
+
+```powershell
+Set-ExecutionPolicy Unrestricted -Scope Process; iex (iwr "https://raw.githubusercontent.com/reemus-dev/gitnr/main/scripts/install.ps1").Content
 ```
 
-### From Source
+### Manual Install
+
+#### Binary Download
+
+See the [releases page](https://github.com/reemus-dev/gitnr/releases) to download a binary and then add it to a directory in your system path.
+
+#### From Source
 
 ```sh
 git clone --depth=1 github.com/reemus-dev/gitnr