Update README.md

README.md

 # Usage
 1. Create a token here https://gitlab.fbk.eu/-/profile/personal_access_tokens
-2. Run `deleteartifact.sh` passing as first argument the TOKEN and second argument the ProjectId ![projectId](/deleteartifacts) :
+2. Run `deleteartifact.sh` passing as first argument the TOKEN and second argument the ProjectId ![projectId](/deleteartifacts.png) :
     - curl -L https://gitlab.fbk.eu/fbk-scripts/deleteartifacts/-/raw/main/deleteartifacts.sh | bash -s -- TOKEN PROJECTID