QVAC-21220 doc: update npm package homepage metadata

[BrunoCampana]

What problem does this PR solve?

On each npm package's page, the "homepage" field links to the corresponding README on GitHub.
For example: https://www.npmjs.com/package/@qvac/sdk links to https://github.com/tetherto/qvac/tree/main/packages/sdk#readme

Desired behavior:
The npm homepage should always point to the main QVAC website: https://qvac.tether.io

How does it solve it?

Currently, the "homepage" metadata field for all packages in the QVAC monorepo points to their respective README URLs.

This PR performs a bulk edit to update and standardize this specific "homepage" field across all 31 packages published in npm.

Test

The change affects only metadata (the homepage field in the package.json of each package published to npm), with no impact on build or runtime.

To ensure no edits broke the JSON syntax (e.g., a missing comma), I locally validated all packages/*/package.json files using JSON.parse within a Node script that iterates through each file and fails if parsing is unsuccessful.
Result: 32 files parsed successfully, 0 invalid.

[github-actions]

Review Status

Current Status: ✅ APPROVED
Approvals so far: Team Lead: 2

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ❌ (0/1)
- 1 Team Lead OR Management approval ✅ (2/1)

**Bypass rule:** Triggered (2+ Team Lead approvals (Tier 1 exception)). This PR is approved regardless of tier.

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*This comment is automatically updated when reviews change.*

[BrunoCampana]

/review