doc: update (#859)

Signed-off-by: frank-zsy <[email protected]>

README.md

@@ -25,6 +25,10 @@ For study purpose, you can checkout the Clickhouse demo notebook
 
 We use [GHArchive](https://www.gharchive.org/) as our data source for GitHub event logs and the data service is provided by [clickhouse](https://clickhouse.tech/) cluster cloud service. For data details, please check the [data](https://github.com/X-lab2017/open-digger/blob/master/docs/data.md) docs.
 
+### Sample Data Usage
+
+OpenDigger provides ClickHouse sample data and Jupyter notebook image to run OpenDigger in local environment, please refer to [sample data doc](./sample_data/README.md).
+
 ## Communication
 
 Welcome to join the WeChat group by scanning the QRCode and I will invite you into our WeChat group.

sample_data/README.md

@@ -23,8 +23,10 @@ To use the sample data, at minimum 3 GB memory should be allocated to the contai
 
 ### ClickHouse server image
 
-x86: `docker pull xlab-registry.cn-shanghai.cr.aliyuncs.com/opendigger/open-digger-clickhouse-base:v1`
-Arm: `docker pull xlab-registry.cn-shanghai.cr.aliyuncs.com/opendigger/open-digger-clickhouse-base-arm:v1`
+- x86: `docker pull docker-hub.x-lab.info/opendigger/open-digger-clickhouse-base:v1`
+- ARM: `docker pull docker-hub.x-lab.info/opendigger/open-digger-clickhouse-base-arm:v1`
+
+### Use Notebook image
 
 ## Create sample data