doxygen: reorganize directory structure

The original directory structure was too flat and
inconvenient to view.

The directory is now reorganized according to the
first-level chapters, and some sub-chapters are
moved to the second-level directory.

Note: documentation/env is not moved to
documentation/4.tool because there are too many
external places that reference this path,
especially in bsp, so this directory path remains
as it is.

Signed-off-by: Chen Wang <[email protected]>

1 files changed, 0 insertions, 0 deletions

diff --git a/documentation/3.kernel/timer/figures/05timer_ops.png b/documentation/3.kernel/timer/figures/05timer_ops.png
new file mode 100644
index 0000000000..383a7af750
--- /dev/null
+++ b/documentation/3.kernel/timer/figures/05timer_ops.png