Simplify Dockerfile. This fixes #94.

Dockerfile

@@ -16,18 +16,10 @@ RUN apt-get install --yes curl nodejs npm
 
 RUN update-alternatives --install /usr/bin/node node /usr/bin/nodejs 10
 
-# TODO use other sass impl?
-RUN npm install -g sass browserify
-
 COPY package.json package-lock.json ./
 RUN npm install
 
-COPY assets_source ./assets_source
 COPY assets ./assets
-# RUN browserify assets_source/javascripts/application.js > assets/application.js
-# COPY build-css.sh ./
-# RUN ./build-css.sh
-
 COPY Package.swift LinuxMain.swift ./
 RUN swift package update
 
@@ -36,16 +28,6 @@ COPY Tests ./Tests
 
 RUN swift test && swift build --configuration release
 
-COPY data ./data
-
 EXPOSE 8765
 
 CMD [".build/release/swifttalk-server"]
-
-# RUN apt-get install --yes automake libc6-dbg
-# RUN git clone git://sourceware.org/git/valgrind.git && cd valgrind  && ./autogen.sh && ./configure --prefix=/usr/local && make && make install
-# COPY episode108.txt .
-# RUN swift build --product highlight-html
-# CMD ["cat episode108.txt | .build/debug/highlight-html"]
-#
-# # valgrind --leak-check=full .build/debug/highlight-html < episode108.txt