Add container stuff

docs/Dockerfile

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+FROM docker.io/library/nginx:alpine
+
+RUN apk add git
+
+RUN mkdir -p /opt/little-lines-docs
+
+COPY . /opt/little-lines-docs
+
+WORKDIR /opt/little-lines-docs
+
+RUN mkdocs build
+
+RUN cp -r site/* /usr/share/nginx/html

little-lines-docs.container.example

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+[Unit]
+Description=Little Lines Documentation
+
+[Container]
+ContainerName=little-lines-docs
+Image=little-lines-docs
+PublishPort=8000:80
+
+[Service]
+Restart=always
+
+[Install]
+WantedBy=multi-user.target default.target