Clarify deprecation of all extractors but the maven-plugin-tools-annotations

Every other extractor module page should have a clear hint indicating that it is deprecated:

• https://maven.apache.org/plugin-tools/maven-plugin-tools-java/
• https://maven.apache.org/plugin-tools/maven-script/maven-plugin-tools-beanshell/
• https://maven.apache.org/plugin-tools/maven-script/maven-plugin-tools-ant/
• https://maven.apache.org/plugin-tools/maven-script/index.html

In addition all scripting extractors should be marked as deprecated in code as well: https://github.com/apache/maven-plugin-tools/blob/bdfd250be57bb422f882daec726960678d8c573e/maven-plugin-tools-api/src/main/java/org/apache/maven/tools/plugin/extractor/AbstractScriptedMojoDescriptorExtractor.java#L51 to emit a WARNING when using it.