Add lint github action (#2473)

BUILDING_ON_MAC.md

@@ -1,15 +1,18 @@
 # Building on macOS
+
 #### Note - If you want to develop Chatterino 2 you will also need to install Qt Creator (make sure to install **Qt 5.12 or newer**)
+
 #### Note - Chatterino 2 is only tested on macOS 10.14 and above - anything below that is considered unsupported. It may or may not work on earlier versions
+
 1. Install Xcode and Xcode Command Line Utilites
 2. Start Xcode, settings -> Locations, activate your Command Line Tools
 3. Install brew https://brew.sh/
 4. `brew install boost openssl rapidjson`
 5. `brew install qt`
 6. Step 5 should output some directions to add qt to your path, you will need to do this for qmake
-5. Go into project directory
-6. Create build folder `mkdir build && cd build`
-7. `qmake .. && make`
+7. Go into project directory
+8. Create build folder `mkdir build && cd build`
+9. `qmake .. && make`
 
 If the Project does not build at this point, you might need to add additional Paths/Libs, because brew does not install openssl and boost in the common path. You can get their path using
 
@@ -17,6 +20,7 @@ If the Project does not build at this point, you might need to add additional Pa
 `brew info boost`
 
 If brew doesn't link openssl properly then you should be able to link it yourself using those two commands:
+
 - `ln -s /usr/local/opt/openssl/lib/* /usr/local/lib`
 - `ln -s /usr/local/opt/openssl/include/openssl /usr/local/include/openssl`