Use uv, update to Python 3.13, add docker

Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.13
+
+RUN mkdir /app
+WORKDIR /app
+
+RUN apt update && apt install -y curl
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh
+ENV PATH="/root/.local/bin/:$PATH"
+
+CMD uv sync &&  uv run python3 -m discord_markov