Prepare Dockerfile for official container

Dockerfile

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+# Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+FROM jfloff/alpine-python:2.7-slim
+
+# Set work directory
+WORKDIR /usr/src
+
+# Install packages
+COPY requirements.txt .
+RUN \
+  pip install -r requirements.txt && \
+  pip install mkdocs-material && \
+  rm requirements.txt
+
+# Expose MkDocs default port
+EXPOSE 8000
+
+# Start development server by default
+ENTRYPOINT ["mkdocs"]
+CMD ["serve", "--dev-addr=0.0.0.0:8000"]