Feat: New website

[thisisobate]

Todo

• change theme font
• Add new video resource section
• create hero section
• create why serverless section
• update knative components section
• update navbar with new design
• show version picker only in docs page
• update links
• Make mobile responsive
• Add spacing to the right of the nav menu
• Fix UX for nested nav in mobile
• Remove duplicated top menu items (blog, about, and community)
• change “readdocs” to “docs”
• Update icons to match accordingly
• Polish website to be pixel perfect
• modify old version banner
• Cleanup code

Fixes #6277

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[knative-prow]

Welcome @thisisobate! It looks like this is your first PR to knative/docs 🎉

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: thisisobate
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[nate-double-u]

@dwelsch-esi, FYI while you're doing the assessment.