docs(config): rebuild docs and removed redundant documentation

src/config/private/config.cpp

@@ -29,14 +29,4 @@ bool Config::loadConfig(const std::string& configFile) {
     return true;
 }
 
-bool Config::isKeyInCache(const std::string &key) {
-    return configMap.find(key) != configMap.end();
-}
 
-void Config::addToCache(const std::string &key, const YAML::Node &node) {
-    configMap[key] = node;
-}
-
-void Config::registerUnknownKey(const std::string &key) {
-    unknownKeys.push_back(key);
-}

src/config/public/config.h

@@ -151,6 +151,12 @@ public:
       }
    }
 
+   /**
+    * @brief Print the configuration file path and the YAML root node.
+    * @param os Output stream.
+    * @param config Config object to print.
+    * @return Output stream.
+    */
    friend std::ostream& operator<<(std::ostream& os, const Config& config) {
       if (!config.debug) {
          os << "Config file: " << config.configFilePath << std::endl;