Apply DRY principle to Linux build instructions

Building-on-Linux.md

@@ -6,43 +6,33 @@
 
 **note**: these aren't the only things build at compile time, but  merely what the end-user is expected to use.
 
-## Ubuntu/Debian/Raspbian: Build from source
+## Preparing your system
+
+### Ubuntu/Debian/Raspbian
 
 ```shell
 sudo apt update && sudo apt upgrade
 sudo apt install git cmake make xorg-dev g++ libcurl4-openssl-dev \
                  libavahi-compat-libdnssd-dev libssl-dev libx11-dev \
                  libqt4-dev qtbase5-dev
-git clone https://github.com/debauchee/barrier.git
-# this builds from master,
-# you can get release tarballs instead
-# if you want to build from a specific tag/release
-cd barrier
-./clean_build.sh
-cd build
-sudo make install  # installs to /usr/local/ 
 ```
 
-## Fedora: Build from source:
+### Fedora
 
 ```shell
 sudo dnf install git cmake make gcc-c++ xorg-x11-server-devel \
                  libcurl-devel avahi-compat-libdns_sd-devel \
                  libXtst-devel qt5 qt5-devel openssl-devel
-git clone https://github.com/debauchee/barrier.git
-# this builds from master,
-# you can get release tarballs instead
-# if you want to build from a specific tag/release
-cd barrier
-./clean_build.sh
-cd build
-sudo make install  # installs to /usr/local/ 
 ```
 
-## openSUSE: Build from source:
+### openSUSE
 
 ```shell
 sudo zypper install libdrm-devel libglvnd-devel libICE-devel libQt5Core-devel libQt5Gui-devel libQt5Network-devel libqt5-qtbase-common-devel libQt5Widgets-devel libSM-devel libXinerama-devel libXrandr-devel libXrender-devel
+```
+
+## Building from source
+```shell
 git clone https://github.com/debauchee/barrier.git
 # this builds from master,
 # you can get release tarballs instead