remove pylint action, extend readme, try to fix linux ci build

.github/workflows/pylint.yml

-name: Pylint
-
-on: [push]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.9
-      uses: actions/setup-python@v2
-      with:
-        python-version: 3.9
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install pylint
-    - name: Analysing the code with pylint
-      run: |
-        cd src
-        pylint `ls -R|grep .py$|xargs`

README.md

 # OctoTray Linux Qt client
 
-Simple Python Qt Linux client for OctoPrint. Install on Arch Linux like this:
+This is a simple Qt application living in the system tray.
+It allows remote-control and observation of 3D printers running OctoPrint.
+For the implementation it is using PyQt5.
+Automatic builds are provided for Linux, Windows and macOS.
 
-    makepkg
-    sudo pacman -U octotray-0.2-1-any.pkg.tar.xz
+For more [take a look at OctoTray on my website](https://www.xythobuz.de/octotray.html).
 
-Or on all other linux distros:
+## Building
 
-	sudo cp octotray /usr/bin/octotray
-	sudo cp octotray_icon.png /usr/share/pixmaps/octotray_icon.png
-	sudo cp de.xythobuz.octotray.desktop /usr/share/applications/de.xythobuz.octotray.desktop
+You have different options of building and running OctoTray:
+
+### From Source
+
+OctoTray can simply be run from the checked out repository, if all dependencies are installed.
+
+    ./src/octotray.py
+
+For this you need Python 3 as well as PyQt5.
+
+### Pre-Built Windows Binary
+
+To run OctoTray on MS Windows without much hassle, a pre-built binary is provided, made with [PyInstaller](https://pyinstaller.readthedocs.io) and GitHub Actions.
+
+Simply download the latest version from the GitHub Actions tab, in the artifacts of the most recent build.
+You need to be logged in for this!
+
+You can also find binaries for each release on GitHub.
+
+To create your own binary from source, simply run:
+
+    bash build_win.sh
+
+The resulting executable will be in 'build/dist/win' as well as 'build/dist/OctoTray_Win.zip'.
+
+### Pre-Build macOS Application Bundle
+
+For Mac users, a pre-built application bundle is provided, made with [py2app](https://py2app.readthedocs.io) and GitHub Actions.
+
+Simply download the latest version from the GitHub Actions tab, in the artifacts of the most recent build.
+You need to be logged in for this!
+
+You can also find binaries for each release on GitHub.
+
+To create your own bundle from source, simply run:
+
+    ./build_mac.sh
+
+The generated bundle will then be in 'build/mac/dist/OctoTray.app' as well as 'build/dist/OctoTray_Mac.zip'.
+
+### Arch Linux Package
+
+Create and install an Arch Linux package like this:
+
+    ./build_arch.sh
+    sudo pacman -U dist/octotray-0.3-1-any.pkg.tar.xz
 
 Then run it from your desktop environment menu or even add it to the autostart there.
+
+### Manual Installation on Linux
+
+You can also install the required files manually, which should work for most other Linux distribution and Unices:
+
+    sudo ./build_unix.sh
+
+After logging out and back in, you should find OctoTray in the menu of your graphical desktop environment.
+Take a look at the script to see exactly what is installed where.
+
+### Pre-Built Linux Binary
+
+For completeness, a single pre-build Linux binary is also provided on GitHub, made with PyInstaller like the Windows build.
+It is however not recommended for productive use.
+
+To create it yourself, simply run:
+
+    ./build_linux.sh
+
+The resulting binary will be in 'build/linux/dist' as well as 'build/dist/OctoTray_Linux.zip'.

build_linux.sh

 cp data/* build/linux/
 
 cd build/linux
-pyinstaller --noconfirm --onefile --name=OctoTray --windowed --add-data="octotray_icon.png:." octotray.py
+pyinstaller --noconfirm --onefile --add-data="octotray_icon.png:." octotray.py
 
 zip -r OctoTray_Linux.zip dist/*
 

build_unix.sh

+#!/bin/sh
+
+cp src/octotray.py /usr/bin/octotray
+cp data/octotray_icon.png /usr/share/pixmaps/octotray_icon.png
+cp data/de.xythobuz.octotray.desktop /usr/share/applications/de.xythobuz.octotray.desktop