rename some activities

Signed-off-by: Takashiro <takashiro@qq.com>
Load guide pages on first run

Signed-off-by: Takashiro <takashiro@qq.com>
remove unused layouts

Signed-off-by: Takashiro <takashiro@qq.com>
use HorizontalScrollView instead of deprecated Gallery

Signed-off-by: Takashiro <takashiro@qq.com>