chore: replace kutt.it with kutt.to in sponsor links

[Copilot]

The URL shortener service has migrated from kutt.it to kutt.to. Updates all hardcoded sponsor URLs in the sponsoring data files.

Changes

• application/src/data/pages/sponsoring/en.ts — updated sponsors-fr and sponsors-en hrefs
• application/src/data/pages/sponsoring/fr.ts — same

- href: 'https://kutt.it/sponsors-fr'
+ href: 'https://kutt.to/sponsors-fr'

Original prompt

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This section details on the original issue you should resolve

<issue_title>Replace domain kutt.it by kutt.to</issue_title>
<issue_description>The URL shortener we are using has moved from kutt.it to kutt.to, please update all links accordingly</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Replace domain kutt.it by kutt.to #130

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[github-actions]

Code Coverage Report

Coverage Results

Test Results

Status	Count
✅ Passed	72
❌ Failed	0
⏭️ Skipped	0
Total	72

✅ Pass Rate: 100.0%

Coverage

Metric	Covered	Total	Percentage
Lines	483	509	94.89%
Branches	380	452	84.07%
Functions	118	122	96.72%

Overall: 94.89% 🟢
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