* Readme: update description and add cncf logo
Signed-off-by: Cwen Yin <cwenyin0@gmail.com>

* Update chaos mesh logo
Signed-off-by: cwen0 <cwenyin0@gmail.com>

* chore: resize images to 450px
Signed-off-by: Yue Yang <g1enyy0ung@gmail.com>
Signed-off-by: Cwen Yin <cwenyin0@gmail.com>
Signed-off-by: cwen0 <cwenyin0@gmail.com>
Signed-off-by: Yue Yang <g1enyy0ung@gmail.com>
Co-authored-by: Yue Yang <g1enyy0ung@gmail.com>