feat(mastodon.tsx): replace old mastodon icon with new icon

[liberaldev]

Description

Replace the old logo of the mastodon with the new logo.

Validation

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.
• [x] I've covered new added functionality with unit tests if necessary.

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Jul 15, 2024 9:01am

[AugustinMauroy]

For your information https://joinmastodon.org/en/branding

[bmuenzenmeyer]

This PR will need to be rebased or recreated now that https://github.com/nodejs/nodejs.org/pull/6850 merged.

[github-actions[bot]]

Unit Test Coverage Report

Unit Test Report

Tests	Skipped	Failures	Errors	Time
131	0 :zzz:	0 :x:	0 :fire:	5.273s :stopwatch:

[mikeesto]

I've rebased this in the interests of getting it merged soon

It looks like the UI change will need to be approved in Chromatic