added docs/repo link to homepage (#7008)
### Description
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Changed the navigation component to add repo/docs link in homepage
### Testing Instructions
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1. the conditional logic was earlier checking if site returned repo or
pack and then showed the docs
2. i changed the logic to check if docs has not been added it will add
docs on all pages navigation and then if site has not returned repo or
pack it will set the default docs route to repo/docs
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Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
