[STREAM]moved Get started up

[daisyfaithauma]

Summary

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the 'Get Started' documentation for Stream, improving organization and clarity.

• Moved the 'Get Started' section to a higher priority in the sidebar navigation
• Adjusted the order of the 'Upload videos' section in the sidebar
• Enhanced formatting for better readability
• Updated response examples for consistency

Modified Files

• src/content/docs/stream/get-started.mdx
• src/content/docs/stream/uploading-videos/index.mdx

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