Update documentation

Docker/Dockerfile

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+FROM archlinux
+
+# Update Arch and install gcc, python and pip and remove cache
+RUN pacman -Syu --noconfirm && pacman --noconfirm -S gcc python python-pip git && yes | pacman -Scc
+
+# Copy requirements for the bot and install them
+COPY requirements.txt /tmp/
+RUN pip install --disable-pip-version-check --no-cache-dir --requirement /tmp/requirements.txt
+
+# Create user
+RUN useradd --create-home botuser
+WORKDIR /home/botuser
+USER botuser
+
+RUN mkdir -p ~/data
+
+# Copy bot and run
+COPY main.py .
+CMD ["python", "./main.py"]