[FastDeploy] Improve Readme and API. (#9441)

* Fix padding value in rec model, and box sort in det model

* Add FastDeploy support to deploy PaddleOCR models.

* Improve readme

* improve readme

* improve readme

* improve code

* improve readme

deploy/fastdeploy/README.md

@@ -12,7 +12,7 @@
 
 <div align="center">
 
-<img src="https://user-images.githubusercontent.com/31974251/219546373-c02f24b7-2222-4ad4-9b43-42b8122b898f.png" >
+<img src="https://user-images.githubusercontent.com/31974251/224941235-d5ea4ed0-7626-4c62-8bbd-8e4fad1e72ad.png" >
 
 </div>