fix: lens-next-app - improve readme with getting started steps

[krzysu]

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Name	Status	Preview	Updated (UTC)
lens-sdk-example-web-wagmi	✅ Ready (Inspect)	Visit Preview	May 14, 2024 0:30am

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This pull request has been linked to 1 task:

• T-20376 Next.js template: document steps (unlink task)

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