Revert "Update: README.md for dbms" flow chart

This reverts commit a367b9253e.

README.md

@@ -4,18 +4,6 @@ A light weight personal music streaming platform.
 
 ## Introduction
 
-This is a music streaming platform software developed to manage (index, search, tag, review)  **large amount** of music (also video) files. Also it can use `ffmpeg` to re-encode music stream so that you can enjoy your huge lossless music via slow and unstable network.
-
-If you:
-
-- Collect a lot of music
-
-- Want to use a "clean" music player
-
-- Want to stream music via network
-
-Then this will be a good choice for you.
-
 ![demo1](demo1.jpg)
 
 [TOC]
@@ -30,22 +18,6 @@ Then this will be a good choice for you.
 
 - Manage files' information in the database, including adding tags, comments, etc.
 
-### How it works
-
-First, administrator run the back-end program, then setup an admin account. Then he/she can update database with a root directory and a file pattern list.
-
-After setting up, user can enjoy music.
-
-```sequence
-Title: Flow chat
-User browser->Backend server: Open web page
-Backend server->User browser: font end files
-User browser->Backend server: JavaScript request
-Backend server->Database: SQL Query
-Backend server->File system: Access file
-Backend server->User browser: Return music stream
-```
-
 ### What it won't do
 
 - Modify your file.