config: Deprecate feature flag class

libraries/config/src/main/java/com/fancyinnovations/config/ConfigHelper.java

@@ -1,4 +1,4 @@
-package de.oliver.fancylib;
+package com.fancyinnovations.config;
 
 import org.bukkit.configuration.file.FileConfiguration;
 

libraries/config/src/main/java/com/fancyinnovations/config/featureflags/FeatureFlag.java

@@ -1,5 +1,9 @@
 package com.fancyinnovations.config.featureflags;
 
+/**
+ * Use ConfigOption instead of this class.
+ */
+@Deprecated
 public class FeatureFlag {
 
     private final String name;

libraries/config/src/main/java/com/fancyinnovations/config/featureflags/FeatureFlagConfig.java

@@ -8,6 +8,10 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Use Config instead of this class.
+ */
+@Deprecated
 public class FeatureFlagConfig {
 
     private final Plugin plugin;