Introduce new Apache and NGINX mode. Enhance docs.

Dockerfile

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+FROM elixir:1.6-alpine
+
+env MIX_HOME /mix
+env MIX_ARCHIVES /mix-archives
+
+# Prepare system
+RUN apk add --no-cache --virtual .build alpine-sdk git rsync
+
+# Perform a clone that can be cached
+WORKDIR /pleroma
+RUN git clone --progress https://git.pleroma.social/pleroma/pleroma.git .
+
+# Bust the cache with a build arg
+# that is different on every build
+ARG __BUST_CACHE
+ENV __BUST_CACHE $__BUST_CACHE
+
+# Update pleroma
+ARG PLEROMA_VERSION
+RUN \
+    git checkout $PLEROMA_VERSION && \
+    git pull --rebase --autostash
+
+# Inject config
+ADD ./docker-config.exs /docker-config.exs
+RUN \
+    ln -s /docker-config.exs config/prod.secret.exs && \
+    ln -s /docker-config.exs config/dev.secret.exs
+
+# Correct paths
+WORKDIR /
+VOLUME /custom.d
+
+# Register entrypoint
+ADD ./entrypoint.ash /
+RUN chmod +x /entrypoint.ash
+CMD ["/entrypoint.ash"]
+
+# Call entrypoint to precompile pleroma
+RUN /entrypoint.ash onbuild
+
+EXPOSE 4000