Update Android container build instructions

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-# Docker image to build the Android
-
-This folder contains the necessary files to create a Docker image that can be used to build the
-Android app without having to configure the local environment first. The image contains the
-Android SDK, the Android NDK, the patched Go compiler, the Rust compiler and the necessary
-configuration to allow the app to build.
-
-To build the image, the following command can be used while inside this directory:
-
-```
-docker build -t mullvad/mullvadvpn-app-android .
-```
-
-After the image has been built, it can be used to build the Android app. Given that the source code
-[repository](https://github.com/mullvad/mullvadvpn-app) was checkout out on
-`/home/user/mullvadvpn-app`, the following command will build the APK there:
-
-```
-docker run \
-    --rm \
-    -it \
-    --name mullvad-android-build \
-    -v /home/user/mullvadvpn-app:/project \
-    -w /project \
-    mullvad/mullvadvpn-app-android
-```
-
-The container can be configured to build the native libraries for a subset of the supported
-architectures by setting the `ARCHITECTURES` environment variable. The supported architecuters are:
-
-- 64-bit ARMv8: `aarch64`
-- 32-bit ARMv7: `armv7`
-- 64-bit x86-64: `x86_64`
-- 32-bit x86: `i686`
-
-The example below builds only for 64-bit ARM and x86-64:
-
-```
-docker run \
-    --rm \
-    -it \
-    -e ARCHITECTURES="aarch64 x86_64" \
-    --name mullvad-android-build \
-    -v /home/user/mullvadvpn-app:/project \
-    -w /project \
-    mullvad/mullvadvpn-app-android
-```
-
-## Speeding up the build with caches
-
-To speed up the build, some cache files for Cargo and Gradle can be reused between builds. There are
-two options to configure reusing those files: creating directories for them in the repository or
-creating separate volumes.
-
-### Using extra directories inside the repository
-
-Two directories can be created inside the repository, `.gradle-home` and `.cargo-home`. When
-building, they can be configured to be used by the build using environment variables
-(`GRADLE_USER_HOME` and `CARGO_HOME`). The following command shows how to run the build container
-using the extra directories:
-
-```
-docker run \
-    --rm \
-    -it \
-    --name mullvad-android-build \
-    -v /home/user/mullvadvpn-app:/project \
-    -e GRADLE_USER_HOME=/project/.gradle-home \
-    -e CARGO_HOME=/project/.cargo-home \
-    -w /project \
-    mullvad/mullvadvpn-app-android
-```
-
-### Using Docker volumes
-
-Some extra volumes can be used to cache Cargo and Gradle data. The following commands set up those
-volumes and runs the build container using them:
-
-```
-# Run these commands once
-docker volume create cargo-git
-docker volume create cargo-registry
-docker volume create gradle-cache
-
-# Run this command every time to build
-docker run \
-    --rm \
-    -it \
-    --name mullvad-android-build \
-    -v /home/user/mullvadvpn-app:/project \
-    -v cargo-git:/root/.cargo/git \
-    -v cargo-registry:/root/.cargo/registry \
-    -v gradle-cache:/root/.gradle \
-    -w /project \
-    mullvad/mullvadvpn-app-android
-```