switch to official Antora Plugin for Gradle

- lock version to latest release of Antora 3.1
- declare Node.js dependencies in build.gradle
- use Node.js version provided by plugin
- assign environment variables using environments property on extension block
- move group and description project properties to gradle.properties
- remove unneeded .npmrc
- upgrade to Gradle 7.5.1
- pass -q when running gradlew from Collector

build.gradle

@@ -1,27 +1,16 @@
 plugins {
-	id "io.github.rwinch.antora" version "0.0.2"
-}
-
-group = 'org.springframework.security'
-description = 'Spring Security'
-
-node {
-	version = "16.17.0"
+	id 'org.antora' version '1.0.0-alpha.3'
 }
 
 antora {
-	antoraVersion = "3.1.0"
-	arguments = ["--clean", "--fetch", "--stacktrace"]
-}
-
-tasks.antora {
+    version = '~3.1'
+	options = ['--clean', '--fetch', '--stacktrace']
 	environment = [
-		"ALGOLIA_API_KEY" : "82c7ead946afbac3cf98c32446154691",
-		"ALGOLIA_APP_ID" : "244V8V9FGG",
-		"ALGOLIA_INDEX_NAME" : "security-docs"
+		'ALGOLIA_API_KEY': '82c7ead946afbac3cf98c32446154691',
+		'ALGOLIA_APP_ID': '244V8V9FGG',
+		'ALGOLIA_INDEX_NAME': 'security-docs'
+    ]
+	dependencies = [
+		'@antora/collector-extension': '1.0.0-alpha.2'
 	]
 }
-
-repositories {
-	mavenCentral()
-}