delete useless file

src/main/resources/META-INF/persistence.xml

-<?xml version="1.0" encoding="UTF-8"?>
-<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
-    <persistence-unit name="mip-persistence">
-        <class>org.hbp.mip.model.Article</class>
-        <properties>
-            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQL82Dialect"/>
-            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
-            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/mirco"/>
-            <property name="hibernate.connection.username" value="mirco"/>
-            <property name="hibernate.connection.password" value="pass"/>
-            <property name="hibernate.default_schema" value="public"/>
-        </properties>
-    </persistence-unit>
-</persistence>