> Supported boards moved to new folder
> Titles updated as per review for code and tools downloading
> References and link issue fixed

Spotted by Jaroslaw. Thanks.
 
Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

Mention how we should use --from to keep original git author attribution
in place.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

Update documentation/source/readme/images/.gitkeep, documentation/source/readme/images/Font_style.PNG, documentation/source/readme/images/List-table.PNG, documentation/source/readme/images/List.PNG, documentation/source/readme/images/csv_table.PNG, documentation/source/readme/images/math.PNG, documentation/source/readme/images/multi-column_list.PNG, documentation/source/readme/images/multi_data.PNG, documentation/source/readme/images/tables.PNG, documentation/source/readme/images/toctree.PNG files