Publish Testnet related documentation

[veaceslavdoina]

Description:

Add Testnet information

Related Issue(s):

https://github.com/codex-storage/infra-codex/issues/125

Changes Included:

• Index page is replaced with Testnet related information

Implementation Details:

We need to publish Testnet related information and guides

Testing:

• Local deployment via yarn
• Netlify should show a preview

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[netlify]

✅ Deploy Preview for docs-codex-storage ready!

Name	Link
🔨 Latest commit	0b47fac
🔍 Latest deploy log	https://app.netlify.com/sites/docs-codex-storage/deploys/65c50adcdbffb10008bcd615
😎 Deploy Preview	https://deploy-preview-7--docs-codex-storage.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[veaceslavdoina]

I see at least one broken part on preview, but locally it looks correctly