Nexus docs expansion (revised)

[Genesis3800]

Solves

• Ad-hoc task
• PR submitted as part of completing this task: availproject/roadmap/issues/874

Summary of changelogs

• This PR was made as a replacement for PR Nexus docs expansion #670 to accommodate revised changes more conveniently.
• Added a barebones empty Tutorials top-level to accommodate new Nexus content.
• Moved nexus-core & nexus-widgets pages up a level for simplifying sidebar.
• Moved introduction-to-nexus page up a level for simplifying sidebar.
• Added appropriate redirects for all migrations to ensure no 404s.
• Added some custom icons under components/icons.
• Added some custom CSS to accommodate said icons.
• Added a page for quicker access to all nexus-related resources for devs.
• Added tutorials around initializing the Nexus SDK, more to come in soon.

Checklist

• run pnpm build locally to make sure build compiles without errors.

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Oct 10, 2025 5:20pm
old-docs-api	Ready	Preview	Comment	Oct 10, 2025 5:20pm