Website fixes: Java version, removed links to deprecated other framew…

…orks, fixed Javadoc links in tutorial

opt4j-tutorial/src/main/tutorial/javadoc.properties

@@ -1,7 +1,7 @@
-Creator=<a class="jdoc" href="../../javadoc/@version@/index.html?org/opt4j/core/problem/Creator.html">Creator</a>
-Decoder=<a class="jdoc" href="../../javadoc/@version@/index.html?org/opt4j/core/problem/Decoder.html">Decoder</a>
-Evaluator=<a class="jdoc" href="../../javadoc/@version@/index.html?org/opt4j/core/problem/Evaluator.html">Evaluator</a>
-Opt4J=<a class="jdoc" href="../../javadoc/@version@/index.html?org/opt4j/core/start/Opt4J.html">Opt4J</a>
+Creator=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/problem/Creator.html">Creator</a>
+Decoder=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/problem/Decoder.html">Decoder</a>
+Evaluator=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/problem/Evaluator.html">Evaluator</a>
+Opt4J=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/start/Opt4J.html">Opt4J</a>
 genotype=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/genotype/package-summary.html">genotype</a>
 addEvaluator=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/problem/ProblemModule.html#addEvaluator(java.lang.Class)">addEvaluator(..)</a>
 ProblemModule=<a class="jdoc" href="../../javadoc/@version@/org/opt4j/core/problem/ProblemModule.html">ProblemModule</a>

opt4j-tutorial/src/main/tutorial/tutorial.xhtml

@@ -25,12 +25,10 @@
 	</h2>
 
 	<p>
-		Opt4J requires Java 6. To compile the following examples, you will
-		need the JDK installed which can be downloaded from <a
-			href="http://www.oracle.com/technetwork/java/javase/downloads/jdk6u37-downloads-1859587.html">here</a>.
-		Opt4J is distributed as single .zip file that can be downloaded from <a
-			href="https://github.com/felixreimann/opt4j">here</a>. After
-		extracting the files, the folder structure looks like this:
+		Opt4J currently requires Java 21.
+		To compile the following examples, you will need the respective JDK installed.
+		Opt4J is distributed as single .zip file that can be downloaded from <a href="https://github.com/sdarg/opt4j/releases">here</a>.
+		After extracting the files, the folder structure looks like this:
 	</p>
 	<ul class="iconlist">
 		<li class="folder">opt4j-@version@</li>

src/main/website/index.html

@@ -96,13 +96,10 @@ <h4>Other Optimization Frameworks</h4>
 					<td>
 						<ul>
 						<li><a href="http://sourceforge.net/projects/jmetal/">JMetal</a></li>
-						<li><a
-							href="http://www.ra.cs.uni-tuebingen.de/software/JavaEvA/">JavaEvA</a></li>
 						<li><a href="http://watchmaker.uncommons.org/">Watchmaker</a></li>
 						<li><a href="http://cs.gmu.edu/~eclab/projects/ecj/">ECJ</a></li>
 						<li><a href="http://jclec.sourceforge.net/">JCLEC</a></li>
 						<li><a href="http://jgap.sourceforge.net/">JGAP</a></li>
-						<li><a href="http://www.aridolan.com/ga/gaa/gaa.html">GAA</a></li>
 						<li><a href="http://sourceforge.net/projects/jenes/">Jenes</a></li>
 						<li><a href="http://www.moeaframework.org/index.html">MOEA
 								Framework</a></li>
@@ -111,10 +108,8 @@ <h4>Other Optimization Frameworks</h4>
 					</td>
 					<td>
 						<ul>
-						<li><a href="http://paradiseo.gforge.inria.fr/">Paradiseo</a></li>
 						<li><a href="http://eodev.sourceforge.net/">EO</a></li>
-						<li><a href="http://www.tik.ee.ethz.ch/sop/pisa/">PISA</a></li>
-						<li><a href="http://beagle.gel.ulaval.ca/">Open Beagle</a></li>
+						<li><a href="https://github.com/chgagne/beagle">Open Beagle</a></li>
 						<li><a href="http://dev.heuristiclab.com/">Heuristic Lab</a></li>
 						</ul>
 					</td>