README: Use absolute links to the images

README.md

@@ -55,20 +55,20 @@ in the various scenarios. For example:
 
 ### Single HTTP/1.1 requests scenario
 
-![Single requests](docs/single_x100_1k.png)
+![Single requests](https://docs.gufolabs.com/gufo_http/single_x100_1k.png)
 *Lower is better*
 
 ### 100 Linear HTTP/1.1 requests scenario
 
-![Linear requests](docs/linear_x100_1k.png)
+![Linear requests](https://docs.gufolabs.com/gufo_http/linear_x100_1k.png)
 *Lower is better*
 
 ### 100 Parallel HTTP/1.1 requests scenario
 
-![Parallel requests](docs/p4_x100_1k.png)
+![Parallel requests](https://docs.gufolabs.com/gufo_http/p4_x100_1k.png)
 *Lower is better*
 
-Refer to [benchmarks](benchmarks/README.md) for details.
+Refer to [benchmarks](https://docs.gufolabs.com/gufo_http/benchmarks/) for details.
 
 ## On Gufo Stack