doxygen: move device_driver under to components for pages

In line with the layout of the source code, the
Device-Driver submodule should belong to components.

The doxygen Module part has been adjusted. This commit
modifies the markdown document part and moves the
device-driver pages under to components.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

documentation/6.components/INDEX.md

@@ -1,7 +1,8 @@
 @page page_components Components
 
-- @subpage page_component_finsh
 - @subpage page_component_vfs
+- @subpage page_device
+- @subpage page_component_finsh
 - @subpage page_component_utest
 - @subpage page_component_dlmodule
 - @subpage page_component_sal

documentation/6.components/device-driver/INDEX.md

@@ -1,4 +1,4 @@
-@page page_device Device
+@page page_device Device Driver
 
 - @subpage page_device_framework
 - @subpage page_device_pin

documentation/INDEX.md

@@ -6,47 +6,9 @@
 
 @subpage page_kernel_core
 
-- @ref page_kernel_basics
-- @ref page_thread_management
-- @ref page_clock_management
-- @ref page_thread_sync
-- @ref page_thread_comm
-- @ref page_memory_management
-- @ref page_interrupt_management
-- @ref page_kernel_porting
+@subpage page_components
 
 @subpage page_tool
 
-- @ref page_env
-- @ref page_scons
-
-@subpage page_device
-
-- @ref page_device_framework
-- @ref page_device_pin
-- @ref page_device_uart
-- @ref page_device_adc
-- @ref page_device_i2c
-- @ref page_device_spi
-- @ref page_device_pwm
-- @ref page_device_rtc
-- @ref page_device_hwtimer
-- @ref page_device_watchdog
-- @ref page_device_wlan
-- @ref page_device_sensor
-
-@subpage page_components
-
-- @ref page_component_finsh
-- @ref page_component_vfs
-- @ref page_component_utest
-- @ref page_component_dlmodule
-- @ref page_component_sal
-- @ref page_component_at
-- @ref page_component_posix
-- @ref page_component_ulog
-- @ref page_component_pm
-- @ref page_component_network
-
 @subpage page_code_contribution