home page new design implementation

[ShravaniAK]

issue #6040

changes made :

1. replaced the svg for "Why serverless containers" section .
2. aligned the text to center of "Knative Components" section.
3. replaced the svg for "Trying it all together" section

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[ShravaniAK]

/cc @Cali0707 @aliok

[Cali0707]

@ShravaniAK when I hover over the SVGs in the "why serverless containers" section, the text seems to be shifted down. Would you be able to fix this?

[ShravaniAK]

hey @Cali0707 , I have fixed the hovering issue over the SVGs, and also did some minor styling fixes.

[Cali0707]

/approve

@mmejia02 @zainabhusain227 can one of you review this and add an lgtm if it looks good to you?

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, ShravaniAK

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