Add Docker build and update docs

docker/Dockerfile

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+FROM node:lts-buster-slim
+
+MAINTAINER Dave Stephens <dave@force9.org>
+
+ENV NVM_DIR /root/.nvm
+ENV DEBIAN_FRONTEND noninteractive
+
+COPY . /enigma-bbs
+
+# Do some installing!
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    build-essential \
+    python \
+    libssl-dev \
+    lrzsz \
+    arj \
+    lhasa \
+    unrar-free \
+    p7zip-full \
+  && npm install -g pm2 \
+  && cd /enigma-bbs && npm install --only=production \
+  && apt-get remove build-essential python libssl-dev git curl -y && apt-get autoremove -y \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
+  && apt-get clean
+
+# sexyz
+COPY docker/bin/sexyz /usr/local/bin
+
+# enigma storage mounts
+VOLUME /enigma-bbs/art
+VOLUME /enigma-bbs/config
+VOLUME /enigma-bbs/db
+VOLUME /enigma-bbs/filebase
+VOLUME /enigma-bbs/logs
+VOLUME /enigma-bbs/mods
+VOLUME /mail
+
+# Enigma default port
+EXPOSE 8888
+
+WORKDIR /enigma-bbs
+
+CMD ["pm2-runtime", "main.js"]