Restructure package managers in cross-platform or platform specific.

Author: SergioRAgostinho

assets/main.scss

@@ -39,6 +39,10 @@
   text-align: center;
 }
 
+.column-2 {
+  flex: 50%;
+}
+
 .column-3 {
   flex: 33.33%;
 }

downloads.md

@@ -7,49 +7,53 @@ permalink: /downloads/
 ## Prebuilt binaries
 
 
-Point Cloud Library (PCL) runs on many operating systems, and prebuilt binaries are available for Linux, Windows, and macOS. In addition to installing PCL, you will need to download and compile a set of 3rd party libraries that PCL requires in order to function. Select the operating system of your choice below to continue.
+Point Cloud Library (PCL) runs on many operating systems, and prebuilt binaries are available for Linux, Windows, and macOS. In addition to installing PCL, you will need to download and compile a set of 3rd party libraries that PCL requires in order to function. To sidestep all that trouble, we recommend you to install PCL through one of the many available package managers out there. Package managers are the preferred distribution mechanism to download PCL. We provide a couple of options below dependent on your platform of choice.
 
 <div class="row">
-	<div class="column column-3 icon-with-text">
+	<div class="column column-2 icon-with-text">
+		<a href="#cross-platform" class="clear"><div class="fas fa-desktop icon-large"></div></a>
+		<p><a href="#cross-platform">Cross-Platform</a></p>
+	</div>
+	<div class="column column-2 icon-with-text">
 		<a href="#linux" class="clear"><div class="fab fa-linux icon-large"></div></a>
 		<p><a href="#linux">Linux</a></p>
 	</div>
-	<div class="column column-3 icon-with-text">
-		<a href="#macos" class="clear"><div class="fab fa-apple icon-large"></div></a>
-		<p><a href="#macos">macOS</a></p>
-	</div>
-	<div class="column column-3 icon-with-text">
-		<a href="#windows" class="clear"><div class="fab fa-windows icon-large"></div></a>
-		<p><a href="#windows">Windows</a></p>
-	</div>
 </div>
 
-We also provide packaged binaries and installers for a couple of platforms in our [Releases](https://github.com/PointCloudLibrary/pcl/releases) page on [GitHub](https://github.com/). Be sure to check that out, in case you're looking for something different than what is provided in the options below.
+An extensive list of package managers which distribute PCL is available at [repology](https://repology.org/project/pcl-pointclouds/packages).
+Nevertheless, we also provide packaged binaries and installers for a couple of platforms in our [Releases](https://github.com/PointCloudLibrary/pcl/releases) page on [GitHub](https://github.com/). Be sure to check that out, in case you're looking for something different than what is provided in the options below.
 
-### Linux
+## Cross-Platform
 
-PCL is available in a number of Linux distributions namely Ubuntu, Debian, Fedora, Gentoo and Arch Linux systems to name a few. The full list of available packages is available at [repology](https://repology.org/project/pcl-pointclouds/packages). Below we provide installation instructions for some of the most popular distributions. If the distribution you use is not here feel free to add it.
+In case your OS does not have a dedicated package manager, consider one of the following options.
 
-#### Ubuntu and Debian
+### vcpkg
 
-<span class="fab fa-ubuntu icon-large"></span>
+[vcpkg](https://github.com/microsoft/vcpkg) is a cross-platform open source package manager created by Microsoft, available for Windows, Linux and macOS. To install PCL on vcpkg-enabled desktops type the following on your terminal
 
-You can install pcl using
 ```
-$ sudo apt install libpcl-dev
+PS> .\vcpkg install pcl
 ```
 
-### macOS
+This is our recommended installation method for **Windows** users.
+
+### Homebrew
+
+[Homebrew](https://brew.sh/) became known as being missing package manager for macOS, but in recent years it extended its support to Linux. To install PCL on Homebrew-enabled desktops type the following on your terminal
 
-The easiest way to install PCL on macOS is through [Homebrew](https://brew.sh/). You can install pcl using
 ```
 $ brew install pcl
 ```
 
-### Windows
+This is our recommended installation method for **macOS** users.
+
+
+## Linux
 
-The easiest and most reliable way to install PCL on Windows is through [vcpkg](https://github.com/Microsoft/vcpkg).
+PCL is available in a number of Linux distributions namely Ubuntu, Debian, Fedora, Gentoo and Arch Linux systems to name a few. Below we provide installation instructions Ubuntu and Debian. You can install pcl using
 
 ```
-PS> .\vcpkg install pcl
+$ sudo apt install libpcl-dev
 ```
+
+This is our recommended installation method for **Linux** users.