Move Dockerfile into docker/...

docker/dev/Dockerfile

@@ -0,0 +1,23 @@
+FROM node:lts-alpine
+
+# where the files live
+WORKDIR /app
+
+# get the sauce
+COPY /src/ /app/src/
+
+# add `/app/node_modules/.bin` to $PATH
+ENV PATH /app/node_modules/.bin:$PATH
+
+# make sure the packages are the same
+COPY package-lock.json /app/package.json
+
+# install and cache app dependencies
+COPY package.json /app/package.json
+RUN npm install
+
+# start app
+CMD ["npm", "run", "serve"]
+
+# allow to be peeked inside
+EXPOSE 8080