design changes in about and community section

[ShravaniAK]

1. in the community section i have replaced the image with the new designed image
2. in the about section made the font color , weight and image size changes .

[knative-prow]

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[Cali0707]

For this image:

Would it be possible to:

1. Replace the central box background with a lighter shade of blue from the design system color scheme
2. Change the font for Knative/Kubernetes to match the other font in the image