Performance - contributors component refactor

[pettinarip]

Description

Immediately display the contributors modal button to reduce LCP.

Other changes:

• Used the MdChevronRight icon to match the initial close state and avoid the initial animation causing the LCP to be higher sometimes
• Removed the Skeletons and add one inside the modal

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Tests after changes

Webpagetest https://www.webpagetest.org/result/240430_BiDc8E_92E/

All the LCPs are the same now, ~2/3s.

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[nloureiro]

yes, this is the temporary change we agreed on the other day.

Can I ask just to add the same spacing above and below the title?
I think it's var(--eth-space-8) between the title and the button

[pettinarip]

@nloureiro fixed