Update blimp documentation and add examples

blimp/docs/build.md

 # Using GN
 Blimp only supports building using [GN](../../tools/gn/README.md). A quick
 overview over how to use GN can be found in the GN
 [quick start guide](../../tools/gn/docs/quick_start.md).
 
 There are three different build configurations depending on what you want to
 build:
 
 ## Android client
 
@@ skipping 24 matching lines @@
 You can also build and install incremental APK like this:
 
 ```bash
 ninja -C out-android/Debug blimp blimp_apk_incremental &&
     out-android/Debug/bin/install_blimp_apk_incremental
 ```
 
 ## Engine inside a Docker container
 
 Create another out-directory and set the GN args. Note, when building to run
-inside a Docker container you'll need to set the target_os to "chromeos":
+inside a [Docker container](container.md) you'll need to set the target_os to "chromeos":
 
 ```bash
 mkdir -p out-chromeos/Debug
 gn args out-chromeos/Debug
 ```
 
 This will bring an editor, where you can type in the following:
 
 ```bash
 target_os = "chromeos"
@@ skipping 32 matching lines @@
 use_goma = true
 use_aura = true
 use_ozone = true
 ```
 
 To build:
 
 ```bash
 ninja -C out-linux/Debug blimp
 ```