chore(docs): Remove the now obsolete cross readme

cross/README.md

@@ -1,37 +0,0 @@
-## Cross compilation
-
-The `cross` folder contains a set of convenience scripts (`build.sh` and `test.sh`) for cross-compiling Conduit.
-
-Currently supported targets are
-
-- aarch64-unknown-linux-musl
-- arm-unknown-linux-musleabihf
-- armv7-unknown-linux-musleabihf
-- x86\_64-unknown-linux-musl
-
-### Install prerequisites
-#### Docker
-[Installation guide](https://docs.docker.com/get-docker/).
-```sh
-$ sudo apt install docker
-$ sudo systemctl start docker
-$ sudo usermod -aG docker $USER
-$ newgrp docker
-```
-
-#### Cross
-[Installation guide](https://github.com/rust-embedded/cross/#installation).
-```sh
-$ cargo install cross
-```
-
-### Buiding Conduit
-```sh
-$ TARGET=armv7-unknown-linux-musleabihf ./cross/build.sh --release
-```
-The cross-compiled binary is at `target/armv7-unknown-linux-musleabihf/release/conduit`
-
-### Testing Conduit
-```sh
-$ TARGET=armv7-unknown-linux-musleabihf ./cross/test.sh --release
-```