docs: update nav items

[shahednasser]

• Add new framework dropdown with items to general concepts in Medusa
• Reorganize some existing items + add links to more references
• Add a link to the router / homepage on the Medusa logo
• Add a link to the v1 docs in the right hand menu

Closes DX-1039

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	🔄 Building (Inspect)	Visit Preview	💬 Add feedback	Oct 22, 2024 11:43am
api-reference-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 22, 2024 11:43am
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medusa-dashboard	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 22, 2024 11:43am
resources-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 22, 2024 11:43am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
medusa-docs	⬜️ Ignored (Inspect)			Oct 22, 2024 11:43am

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