Remove Makefiles and update documentation for pure CMake build system

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

kernel/Makefile

@@ -1,79 +0,0 @@
-# MetalOS Kernel Makefile
-
-# Cross-compiler (x86_64 bare metal)
-CC = x86_64-elf-gcc
-AS = nasm
-LD = x86_64-elf-ld
-OBJCOPY = x86_64-elf-objcopy
-
-# Check if cross-compiler exists, fallback to regular gcc
-ifeq ($(shell which $(CC) 2>/dev/null),)
-    CC = gcc
-    LD = ld
-    OBJCOPY = objcopy
-endif
-
-# Directories
-SRC_DIR = src
-INC_DIR = include
-BUILD_DIR = build
-
-# Compiler flags
-CFLAGS = -Wall -Wextra -Werror \
-         -ffreestanding -fno-stack-protector \
-         -mno-red-zone -mcmodel=large \
-         -I$(INC_DIR) \
-         -O2
-
-# Assembler flags
-ASFLAGS = -f elf64
-
-# Linker flags
-LDFLAGS = -nostdlib -T linker.ld
-
-# Source files
-C_SOURCES = $(shell find $(SRC_DIR) -name '*.c')
-ASM_SOURCES = $(shell find $(SRC_DIR) -name '*.asm')
-
-# Object files
-C_OBJECTS = $(patsubst $(SRC_DIR)/%.c,$(BUILD_DIR)/%.o,$(C_SOURCES))
-ASM_OBJECTS = $(patsubst $(SRC_DIR)/%.asm,$(BUILD_DIR)/%.o,$(ASM_SOURCES))
-OBJECTS = $(C_OBJECTS) $(ASM_OBJECTS)
-
-# Output
-TARGET = metalos.bin
-
-.PHONY: all clean
-
-all: $(BUILD_DIR) $(TARGET)
-
-$(BUILD_DIR):
-	mkdir -p $(BUILD_DIR)
-	mkdir -p $(BUILD_DIR)/core
-	mkdir -p $(BUILD_DIR)/hal
-	mkdir -p $(BUILD_DIR)/drivers
-	mkdir -p $(BUILD_DIR)/syscall
-
-# Compile C files
-$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
-	@mkdir -p $(dir $@)
-	$(CC) $(CFLAGS) -c $< -o $@
-
-# Assemble ASM files
-$(BUILD_DIR)/%.o: $(SRC_DIR)/%.asm
-	@mkdir -p $(dir $@)
-	$(AS) $(ASFLAGS) $< -o $@
-
-# Link kernel
-$(TARGET): $(OBJECTS)
-	$(LD) $(LDFLAGS) $(OBJECTS) -o $@
-
-clean:
-	rm -rf $(BUILD_DIR) $(TARGET)
-
-# Print variables for debugging
-info:
-	@echo "C Sources: $(C_SOURCES)"
-	@echo "ASM Sources: $(ASM_SOURCES)"
-	@echo "Objects: $(OBJECTS)"
-	@echo "Compiler: $(CC)"