fix: sveltekit fetch

[jouwdan]

Please check if the PR fulfills these requirements

• The commit message is sensible and easily understood
• Tests for the changes have been added (for bug fixes / features where relevant)
• Docs have been added / updated (for bug fixes / features where relevant)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Fixes the console error when loading courses:

Loading ${COURSE_URL} using window.fetch. For best results, use the fetch that is passed to your load function: https://kit.svelte.dev/docs/load#making-fetch-requests

What commits does this PR relate to?

• fix: sveltekit fetch (bec2089)

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