chore: polish readme to fix dead links

Signed-off-by: lizhanhui <lizhanhui@gmail.com>

README.md

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 # Elastic Stream
 
-[![Codecov](https://img.shields.io/codecov/c/gh/AutoMQ/elastic-stream/master)](https://app.codecov.io/gh/AutoMQ/elastic-stream)
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 ## Overview
 ElasticStream is an open-source, elastic streaming platform. ElasticStream is designed on top of cloud infra-structure, excelling itself in scalability, fault-tolerance, cost-effectiveness and security.
 
 ![Overview](docs/images/elastic-stream-arc.png)
 
 
 ## Getting Started
-If you are brand new to elastic stream, we recommend you checkout our [motivation and architecture](https://elastic-stream.automq.com/docs/category/architecture) first. In case you want to get the system up and run quick demos, please read the [quick-start guide](https://elastic-stream.automq.com/docs/quick-start).
+If you are brand new to elastic stream, we recommend you checkout our [motivation and architecture](docs/architecture) first. In case you want to get the system up and run quick demos, please read the [quick-start guide](docs/quick-start).
 
 ## Documentation
 
-Various docs and guides are placed [here](https://elastic-stream.automq.com).
+Various docs and guides are placed [here](docs).
 
 ## How to Contribute
 We welcome contribution of various types: documentation, bug reporting, feature request, and pull requests. Before proposing a major large-scale change, it is advised to discuss your proposal first.
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-
-## License
-This project is licensed under the [Server Side Public License](https://spdx.org/licenses/SSPL-1.0.html)

docs/README.md

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 # Table of Contents
 
 * [Quick Start](./quick-start.mdx)