feat: add formatting and fixing README of dashboard starter/final example

[moelzanaty3]

This fixes

• README for the dashboard starter/final example typo and formatting
• Add the prettier configuration to have all code formatted
• Fix importing order and remove unused-imports

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Name	Status	Preview	Comments	Updated (UTC)
next-learn-starter	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 28, 2023 7:32pm
next-seo-starter	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 28, 2023 7:32pm

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[delbaoliveira]

Thank you for looking into this @moelzanaty3 😄

There are a couple of changes on this PR, and it would be easier to make smaller, grouped changes.

• I like the idea of adding "prettier-plugin-tailwindcss" and the prettier config file.
• I have some reservations about adding @vercel/style-guide as this would lead to many changes in the code that we'd have to update in the course code snippets.
• Could you please open a PR that only includes the prettier changes? And another for the readme updates. And we can merge. 🙏🏼

[moelzanaty3]

@delbaoliveira thanks for taking the time to review the changes, I opened a 2 PR

[x] one for updating README #316
[x] another one for a prettier #315

will keep you updated