Revert "Add Dockerfile example"

This reverts commit e890513e7c.

Dockerfile

@@ -1,9 +0,0 @@
-FROM debian:bullseye-slim
-
-RUN apt-get update && apt-get -y --no-install-recommends install npm=* nodejs=* \
-     build-essential=* \
-  && apt-get clean && rm -rf /var/lib/apt/lists/*
-
-COPY . /lndhub
-WORKDIR /lndhub
-RUN npm i && npm run build