ADM-952: [frontend] update readme

README.md

@@ -129,7 +129,7 @@ _Image 3-1，home page_
 
 If you are first use the product, you need to select “Create A New Project”，it will go to config page (Image 3-2)
 
-![Image 3-2](https://cdn.jsdelivr.net/gh/au-heartbeat/data-hosting@main/readme/3-2.png)\
+![Image 3-2](https://cdn.jsdelivr.net/gh/au-heartbeat/data-hosting@main/readme/3-2-1.png)\
 _Image 3-2，Project config page_
 
 Users need to select at least one period of time, and users can click the “New time range” button to add up to 6 periods, and then multiple corresponding data reports will be generated on the report page. 
@@ -148,7 +148,7 @@ All need to select which data you want to get, for now, we support seven metrics
 - `Cycle time`: the time it take for each card start to do until move to done.
 - `Classification`: provide different dimensions to view how much efforts team spent within selected time period.
 
-![Image 3-3](https://cdn.jsdelivr.net/gh/au-heartbeat/data-hosting@main/readme/3.png)\
+![Image 3-3](https://cdn.jsdelivr.net/gh/au-heartbeat/data-hosting@main/readme/3-3.png)\
 _Image 3-3，Metrics Data_
 
 ##### 3.1.2.1 Date picker validation rules
@@ -176,7 +176,7 @@ According to your selected required data, you need to input account settings for
 | Dev change failure rate   | Pipeline       |
 | Dev mean time to recovery | Pipeline       |
 
-![Image 3-4](https://cdn.jsdelivr.net/gh/au-heartbeat/data-hosting@main/readme/3-4.png)\
+![Image 3-4](https://cdn.jsdelivr.net/gh/au-heartbeat/data-hosting@main/readme/3-4-1.png)\
 Image 3-4，Project config
 
 **The details for board:**