Remove Maven Central badge from README

Removed Maven Central badge from README.

README.md

@@ -1,6 +1,5 @@
 [![Java CI with Maven](https://github.com/fabioformosa/quartz-manager/actions/workflows/maven.yml/badge.svg)](https://github.com/fabioformosa/quartz-manager/actions/workflows/maven.yml)
 [![npm CI](https://github.com/fabioformosa/quartz-manager/actions/workflows/npm.yml/badge.svg)](https://github.com/fabioformosa/quartz-manager/actions/workflows/npm.yml)
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/it.fabioformosa.quartz-manager/quartz-manager-starter-api/badge.svg)](https://maven-badges.herokuapp.com/maven-central/it.fabioformosa.quartz-manager/quartz-manager-starter-api)  
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=fabioformosa_quartz-manager&metric=coverage)](https://sonarcloud.io/summary/new_code?id=fabioformosa_quartz-manager) [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=fabioformosa_quartz-manager&metric=bugs)](https://sonarcloud.io/summary/new_code?id=fabioformosa_quartz-manager) [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=fabioformosa_quartz-manager&metric=security_rating)](https://sonarcloud.io/summary/new_code?id=fabioformosa_quartz-manager) [![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=fabioformosa_quartz-manager&metric=sqale_rating)](https://sonarcloud.io/summary/new_code?id=fabioformosa_quartz-manager)
 
 # Table Of Contents