deploy: replaced various hardcoded values of the papermark.io domain

[avikalpg]

Replaced various hardcoded values of the papermark.io domain name with appropriate environment variables.

I have assumed that the NEXT_PUBLIC_BASE_URL will be "https://app.papermark.io" and the NEXT_PUBLIC_MARKETING_URL will be "https://www.papermark.io".

[vercel[bot]]

@avikalpg is attempting to deploy a commit to the mftsio Team on Vercel.

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