feat: organize doc index into clearer categories

[Numilani]

Description

In an attempt to make the documentation clearer for new modders, I've re-organized the pages into new groups. Most notably, I've moved several of the most common guides into a section called "Your First Mod", in an attempt to create a more tutorial-like section for those first getting started into modding.

For other guides, I've tried to group them based on topical categories to make it easier to visually locate the type of information one might be looking for, as opposed to the increasingly-lengthy "More Topics" category that was starting to expand out of control.

I welcome suggestions and feedback on how this could be improved beyond the existing changes.

Type of Change

• Documentation fix (typo, grammar, clarification)
• New documentation (guide, tutorial, page)
• Bug fix
• New feature
• Other

Checklist

• Tested locally with bun run dev
• Ran bun audit (no critical vulnerabilities)
• Checked spelling and grammar
• Verified all links work
• Followed Contributing Guidelines

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[Numilani]

Just saw this was marked "awaiting changes" - is there anything I need to modify on my end?

[ItsNeil17]

Just saw this was marked "awaiting changes" - is there anything I need to modify on my end?

Nope, just awaiting a reply from Hypixel