Remove Duktape stubs

Should use QuickJS instead

library/src/main/java/com/squareup/duktape/Duktape.java

@@ -1,26 +0,0 @@
-package com.squareup.duktape;
-
-import java.io.Closeable;
-import java.io.IOException;
-
-@SuppressWarnings("all")
-public class Duktape implements Closeable {
-
-    public static Duktape create() {
-        throw new RuntimeException("Stub!");
-    }
-
-    @Override
-    public synchronized void close() throws IOException {
-        throw new RuntimeException("Stub!");
-    }
-
-    public synchronized Object evaluate(String script) {
-        throw new RuntimeException("Stub!");
-    }
-
-    public synchronized <T> void set(String name, Class<T> type, T object) {
-        throw new RuntimeException("Stub!");
-    }
-
-}