docs: improved create-medusa-app structure

[shahednasser]

• Improved the structure of create-medusa-app guide
• other: changed name of Troubleshooting component to DetailsList.

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Latest commit: 3a8aeec

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 24, 2023 2:54pm
docs-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 24, 2023 2:54pm
medusa-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 24, 2023 2:54pm