add inject code functionality

ruleset.yaml

@@ -2,20 +2,24 @@
   regexRules:
     - match: <script\s+([^>]*\s+)?src="(/)([^"]*)"
       replace: <script $1 script="/https://www.example.com/$3"
-  injectCode: | 
-    <script>
-      window.localStorage.clear();
-      console.log("test");
-    </script>
-- domain: www.anotherdomain.com
-  path: /article
-  googleCache: false
-  regexRules:
+  inject:
+    position: head # Position where to inject the code
+    code: | 
+      <script>
+        window.localStorage.clear();
+        console.log("test");
+        alert("Hello!");
+      </script>
+- domain: www.anotherdomain.com # Domain where the rule applies
+  path: /article                # Path where the rule applies
+  googleCache: false            # Search also in Google Cache
+  regexRules:                   # Regex rules to apply
     - match: <script\s+([^>]*\s+)?src="(/)([^"]*)"
       replace: <script $1 script="/https://www.example.com/$3"
-  injectCode: | 
-    <script>
-      window.localStorage.clear();
-      console.log("test");
-    </script>
-  
+  inject:
+    position: .left-content article .post-title # Position where to inject the code
+    code: | 
+      <script>
+        window.localStorage.clear();
+        console.log("test");
+      </script>