Mission 4 and multiple fixes

[LyonSyonII]

Contents (#14)

New features

• added mission 4
• added onsuccess callback
• added onsuccess callback
• name is now saved to be used later
• added "reset" button when page is in DEV mode
• added remove function
• Changed from Svelte Checkpoint to Astro one
• Removed scroll when problem is completed
• added WIP indicator to new pages

Enhancements

• compressed AdventurersGuildGirl.svg
• changed Checkpoint from Svelte to Astro component with vanilla JS
• added "alt" to hero logo
• "Progress" now loads when "indle" instead of "visible"
• rewritten LanguageDetector component from Svelte to Astro
• Checkpoint now displays a fade in animation when user "prefers-reduced-motion"
• Replaced LanguageDetector for Astro one
• [frontend/src/components/QuestionCard.astro] inlined Icons svg to allow for prefetch
• [QuestionCard.astro] made padding smaller on mobile
• improved SEO

Fixes

• changed "color-mix" to "opacity" for better browser compatibility

Dependencies

• updated dependencies

Chores

• removed logs
• removed logs

Style

• removed unnecessary line
• prettier
• prettier
• fixed padding and margins of QuestionCard and CodeBlock
• removed unnecessary comment

Other

• added comments specifying valid syntax
• added function for guild-girl portrait
• Writing first exercise
• added TODO comment

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