Remove Maven Central repository declaration

Maven Central is available as a repository by default when using Maven, so it's not necessary to add it explicitly.

README.md

@@ -33,20 +33,6 @@ Similar to our mascot, Exposed can be used to mimic a variety of database engine
 
 Releases of Exposed are available in the Maven Central repository. You can declare this repository in your build script as follows:
 
-#### Maven
-
-```xml
-<!-- Versions after 0.30.1 -->
-<!-- Versions before 0.30.1 is unavailable for now-->
-<repositories>
-    <repository>
-        <id>mavenCentral</id>
-        <name>mavenCentral</name>
-        <url>https://repo1.maven.org/maven2/</url>
-    </repository>
-</repositories>
-```
-
 #### Gradle Groovy and Kotlin DSL
 
 **Warning:** You might need to set your Kotlin JVM target to 8, and when using Spring to 17, in order for this to work properly:
@@ -59,6 +45,10 @@ repositories {
 }
 ```
 
+#### Maven
+
+The Maven Central repository is enabled by default for Maven users.
+
 ### Exposed modules
 
 `Exposed` consists of the following modules:

exposed-spring-boot-starter/README.md

@@ -6,14 +6,6 @@ This is a starter for [Spring Boot](https://spring.io/projects/spring-boot) to u
 This starter will give you the latest version of [Exposed](https://github.com/JetBrains/Exposed) and its `spring-transaction` library along with the [Spring Boot Starter Data JDBC](https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jdbc).
 ### Maven
 ```mxml
-<repositories>
-  <repository>
-    <id>mavenCentral</id>
-    <name>mavenCentral</name>
-    <url>https://repo1.maven.org/maven2/</url>
-  </repository>
-</repositories>
-
 <dependencies>
   <dependency>
     <groupId>org.jetbrains.exposed</groupId>