feat: player.delete() function and update documentation

src/objects/Players.cpp

@@ -36,6 +36,10 @@ Player* Players::create() {
     return player;
 }
 
+void Players::remove(int64_t id) {
+    players.erase(id);
+}
+
 dv::value Players::serialize() const {
     auto root = dv::object();
     auto& list = root.list("players");

src/objects/Players.hpp

@@ -25,6 +25,8 @@ public:
 
     Player* create();
 
+    void remove(int64_t id);
+
     dv::value serialize() const override;
 
     void deserialize(const dv::value& src) override;