Fix doc img path in profile readme (#28994)

https://gitea.com/gitea/gitea-docusaurus/actions/runs/1007/jobs/0#jobstep-9-25

usage/profile-readme.en-us.md

@@ -22,4 +22,4 @@ Making the `.profile` repository private will hide the Profile README.
 
 Example of user with `.profile/README.md`:
 
-![profile readme screenshot](./profile-readme.png)
+![profile readme screenshot](/images/usage/profile-readme.png)