fix: use brand icons for migration sidebar

[Kinfe123]

Summary

• replace the generic file icon on every migration guide with its matching documentation-tool brand mark
• add one reusable, theme-aware 16px migration icon component and register all eight icons in docs config
• keep decorative icons hidden from assistive technology while preserving the existing sidebar labels

Verification

• pnpm exec oxfmt --check on all changed files
• pnpm exec oxlint website/components/ui/migration-source-icon.tsx website/docs.config.tsx
• pnpm --dir website exec tsc --noEmit
• pnpm --dir website build
• checked the migration sidebar locally on desktop and mobile in dark and light modes; all eight icons render distinctly at 16×16

---

Summary by cubic

Uses brand icons in the migration sidebar for each documentation source to improve recognition. Previously all guides used a generic file icon; now each guide shows its source’s 16px brand mark. Icons are decorative and hidden from assistive technology, preserving sidebar labels.

• Adds MigrationSourceIcon (theme-aware via currentColor) and registers eight sources in website/docs.config.tsx.
• Updates frontmatter icon values in each migration guide to the matching slugs: docusaurus, mintlify, nextra, fumadocs, vitepress, starlight, gitbook, mkdocs.
• Review: check dark/light contrast and distinct glyphs; confirm aria-hidden and focusable="false" on SVGs.
• Migration: when adding a new migration guide, set its frontmatter icon to one of the registered slugs to render the correct brand mark.

^{Written for commit 3d03f9d. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
docs-website	Ready	Preview	Aug 22, 2026 8:53am
farming-labs-docs-docs-cloud	Building	Preview	Aug 22, 2026 8:53am

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commit: 3d03f9d