Remove unmaintained Docker files and GH workflows

Author: baskerville

.github/workflows/armhf.yml

@@ -7,13 +7,7 @@ git clone https://github.com/baskerville/plato.git
 cd plato
 ```
 
-There are two ways to build *Plato*:
-- [Local *Rust* Setup](#local)
-- [With *Docker*/*Podman*](#docker)
-
-## Local
-
-### Plato
+## Plato
 
 #### Preliminary
 
@@ -62,27 +56,3 @@ You can install the importer with:
 ```sh
 ./install-importer.sh
 ```
-
-## Docker
-
-### Plato
-
-1. Build the image for armhf: `docker build . -t plato:armhf`
-2. The following compiles, mounts a local volume, and outputs the `plato` binary to your local folder `target/arm-unknown-linux-gnueabihf`:
-
-```sh
-docker run --rm -t -v $(pwd)/target:/plato/target plato:armhf
-```
-
-You can copy the binary to your Kobo device (make sure you install an existing release first) and it will run.
-
-### Developer Tools
-
-1. Build the image for dev environments: `docker build . -f Dockerfile.dev -t plato:dev`
-2. The following runs tests, compiles, mounts a local volume, and outputs all binaries to your local folder `target/debug`:
-
-```sh
-docker run --rm -t -v $(pwd):/plato plato:dev
-```
-
-If the emulator or importer fail to run, please follow the steps in [Local–Developer Tools](#developer-tools) to ensure you have the relevant libraries.