fix: Change to 0 value for sample transactions.

[richtera]

The user can still fill in transactions values, but a lot of the sample transactions require the value to be 0 making this confusing.

[github-actions[bot]]

Deployed with Cloudflare Pages :cloud: :rocket: :ok:

• URL: https://fix-zero-value.universalprofile-test-dapp.pages.dev
• Specific: https://c57b6a1a.universalprofile-test-dapp.pages.dev