feat: add Docker support, and documentation for it

Dockerfile

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+FROM node:16
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Install app dependencies
+# A wildcard is used to ensure both package.json AND package-lock.json are copied
+# where available (npm@5+)
+COPY package*.json ./
+
+# Download, and prepare the kepubify binary
+RUN wget https://github.com/pgaskin/kepubify/releases/download/v4.0.4/kepubify-linux-64bit
+RUN mv kepubify-linux-64bit /usr/local/bin/kepubify
+RUN chmod +x /usr/local/bin/kepubify
+
+COPY . .
+
+EXPOSE 3001
+CMD [ "node", "index" ]

README.md

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+# send2ereader
+
+A self hostable service for sending ebooks to a Kobo or Kindle ereader through the built-in browser.
+
+## How To Run
+
+### On Your Host OS
+
+1. Have Node 16 installed
+2. Install this service's dependencies by running `$ npm install`
+3. Install [Kepubify](https://github.com/pgaskin/kepubify), and have the executable in your path.
+4. Start this service by running: `$ node index`
+
+### Containerized
+
+1. Have Docker installed
+2. Run `$ docker compose up`

docker-compose.yaml

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+version: "3"
+services:
+  send2ereader:
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    container_name: send3ereader
+    ports:
+      - 3001:3001