Move sources under src/ for clarity in repo.

Dockerfile

@@ -7,8 +7,8 @@ RUN rm -rf /var/lib/apt/lists/*
 RUN curl -fsSL get.docker.com -o get-docker.sh
 RUN sh get-docker.sh
 
-COPY ./entrypoint.sh /root/
-COPY ./backup.sh /root/
+COPY ./src/entrypoint.sh /root/
+COPY ./src/backup.sh /root/
 RUN chmod a+x /root/entrypoint.sh
 RUN chmod a+x /root/backup.sh