fix: svg warning in HexagonGrid

[theoludwig]

Replace fill-opacity by fillOpacity.

Description

There is a warning about the <HexagonGrid /> svg:

app-index.tsx:26 Warning: Invalid DOM property `fill-opacity`. Did you mean `fillOpacity`?
    at path
    at g
    at svg
    at div
    at div
    at MatterProvider 

Validation

This PR fixes this warning (error is not printed anymore in the console).

Check List

• [x] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [x] I have run npm run format to ensure the code follows the style guide.
• [x] I have run npm run test to check if all tests are passing.
• [x] I have run npx turbo build to check if the website builds without errors.

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Apr 30, 2024 6:02pm

[github-actions[bot]]

Lighthouse Results URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟠 85	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/about/previous-releases	🟢 99	🟢 98	🟢 100	🟢 92	🔗
/en/download	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 100	🟢 92	🔗

[github-actions[bot]]

Unit Test Coverage Report

Lines	Statements	Branches	Functions
	90.04% (588/653)	76.08% (175/230)	92.18% (118/128)

Unit Test Report

Tests	Skipped	Failures	Errors	Time
128	0 :zzz:	0 :x:	0 :fire:	5.686s :stopwatch:

[AugustinMauroy]

Question it's not need to write like html for OG-image because it's was implemented like that when Brian create og engine.

[ovflowd]

Question it's not need to write like html for OG-image because it's was implemented like that when Brian create og engine.

That SVG is a React Component, so it must follow React Props.