chore: meet netlify open source plan requirements

[peetzweg]

As we want to apply for the open source plan of netlify for deploying this repository, I've added a Code of Conduct from the ink repository and added a link in the footer to the netlify page. These changes are required to apply for the open source plan.

https://www.netlify.com/legal/open-source-policy/

[netlify[bot]]

✅ Deploy Preview for contracts-ui ready!

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[netlify[bot]]

✅ Deploy Preview for ink-contracts ready!

Name	Link
🔨 Latest commit	e846467ce3e0d14f9b4c7b3e3fcabaa5a4b02f95
🔍 Latest deploy log	https://app.netlify.com/sites/ink-contracts/deploys/66261ec7bbf910000827f131
😎 Deploy Preview	https://deploy-preview-556--ink-contracts.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[cypress[bot]]

Passing run #407 ↗︎

0	61	0	0	0
⚠️ You've recorded test results over your free plan limit. Upgrade your plan to view test results.

Details:

Merge e846467ce3e0d14f9b4c7b3e3fcabaa5a4b02f95 into b9e63359944759053b6e5836905c...
Project: Contracts UI	Commit: 3d8bd8c559 ℹ️
Status: Passed	Duration: 01:18 💡
Started: Apr 22, 2024 8:26 AM	Ended: Apr 22, 2024 8:28 AM

Review all test suite changes for PR #556 ↗︎