changes(footer): Added CNCF Sandbox information

[yashisrani]

• I added CNCF sandbox information in the footer section

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[yp969803]

fonts are too small

[yp969803]

footer is only needed in welcome page , not in other pages

[yp969803]

@Jayesh0167 please review

[yashisrani]

@jayesh9747 sir, please review this pr

[jayesh9747]

@yashisrani we need simple footer which is already there. you can close your PR. thank you.

[yp969803]

@jayesh9747 it is good if we provide cncf sandbox information in the footer, i think the pr is needed

[hzxuzhonghu]

I can see the logo only on welcome page, but other pages it is not rendered

[yp969803]

@yashisrani i think we can place the sandbox info on welcome page, not on footer

[yp969803]

something like this

as cilium is doing