refactor: update project group name and restructure repositories in Gradle files

Author: TheMeinerLP

build.gradle.kts

@@ -1,14 +1 @@
-plugins {
-    id("java")
-}
-
-group = "net.onelitefeather"
-version = providers.gradleProperty("version").getOrElse("0.0.1-alpha.0")
-
-subprojects {
-    repositories {
-        mavenCentral()
-        maven("https://repo.papermc.io/repository/maven-public/")
-        maven("https://maven.enginehub.org/repo/")
-    }
-}
+group = "net.onelitefeather.voyager"

settings.gradle.kts

@@ -1,6 +1,14 @@
+import org.gradle.kotlin.dsl.mavenCentral
+import org.gradle.kotlin.dsl.repositories
+
 rootProject.name = "Voyager"
 
 dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+        maven("https://repo.papermc.io/repository/maven-public/")
+        maven("https://maven.enginehub.org/repo/")
+    }
     versionCatalogs {
         create("libs") {
             version("paper", "1.21.5-R0.1-SNAPSHOT")