[Lexical-website] BugFix: Change button text colour to improve visibility

[Shopiley]

Description

This pull request changes the text colour of buttons on the lexical website (homepage example section) on dark mode to a darker colour to enhance visibility against the background colour of the button.

Closes #6795

Test plan

Before

After

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

Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 5, 2024 6:35pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 5, 2024 6:35pm

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.92 KB (0%)
lexical - esm	29.78 KB (0%)
@lexical/rich-text - cjs	38.57 KB (0%)
@lexical/rich-text - esm	31.63 KB (0%)
@lexical/plain-text - cjs	37.22 KB (0%)
@lexical/plain-text - esm	28.94 KB (0%)
@lexical/react - cjs	40.33 KB (0%)
@lexical/react - esm	33.06 KB (0%)

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