docker: remove

It seems to me 1) it does not work 2) no one actually uses this.

core/docker/emulator/Dockerfile

@@ -1,15 +0,0 @@
-FROM python:3.7.1-stretch
-
-WORKDIR /trezor-emulator
-
-COPY ./ /trezor-emulator
-RUN make vendor
-
-RUN apt-get update
-RUN apt-get install libusb-1.0-0
-
-RUN pip3 install scons trezor
-RUN make build_unix
-
-ENTRYPOINT ["emulator/run.sh"]
-EXPOSE 21324/udp 21325

core/docker/emulator/run.sh

@@ -1,8 +0,0 @@
-#!/bin/bash
-cd "$(dirname "$0")"
-cd ..
-
-export SDL_VIDEODRIVER=dummy
-export TREZOR_UDP_IP=0.0.0.0
-
-source emu.sh