cplus -> cpp
doc homepage update
update the css
Merge remote-tracking branch 'wm/feature/newdocs' into docs_index_update
docs index update
update css
Merge remote-tracking branch 'wm/feature/newdocs' into docs_index_update
update docs index css
change api index html
update the css  / add some sdk-logo
update css
remove css
change the sdk/cli icon style
update  html vs css
fix api-nav link color bug
Merge pull request #30 from SunLn/docs_index_update

[先不合并] 更新文档首页