refactor: replace custom picker and build scripts with slidev-decks

[afonsojramos]

Summary

Replaces the custom picker.ts and build.ts scripts with slidev-decks — a lean CLI for managing multiple Slidev presentations. This was actually inspired by this repo (mentioned in Prior Art), so it felt right to bring it full circle.

What changes:

• pnpm dev now uses slidev-decks interactive picker (fuzzy matching, sorted by date, title display)
• pnpm build uses slidev-decks build --all --continue-on-error (progress tracking, incremental builds)
• Per-deck build scripts simplified from tsx ../../scripts/build.ts <base> to slidev build --out <dir> --base <base>
• Removed 4 deps only needed for custom scripts: execa, prompts, @types/prompts, tinyexec

What stays the same:

• All deck source code, components, styles, configs
• scripts/redirects.ts (still parses base paths from per-deck build scripts — verified all 35 work)
• netlify.toml deployment, dist-stale caching strategy
• pnpm workspace setup, per-deck dev/export scripts
• All Slidev features (glow effect, graph addon, magic links, custom components)

Net change: 40 lines added, 138 lines removed across 39 files (mostly simplified per-deck package.json build scripts).

What slidev-decks provides over the custom scripts

• Interactive picker with fuzzy matching (substring, word-boundary, subsequence scoring)
• Auto-discovery of slides.md in both flat (<name>/slides.md) and nested (<name>/src/slides.md) layouts
• --continue-on-error for resilient batch builds
• --filter for building subsets (slidev-decks build --all -f "2024-*")
• Incremental builds (skips unchanged decks based on file mtime)
• Progress counter ([3/35]) during batch builds
• Package manager auto-detection (pnpm, bun, npm, yarn)
• slidev-decks list for a quick overview of all decks

Test plan

• slidev-decks list discovers all 35 Slidev decks (2 pre-Slidev PDF-only talks correctly excluded)
• redirects.ts base path extraction still works for all 35 decks (regex matches new build script format)
• pnpm dev launches interactive picker and starts a deck
• pnpm build builds all decks with correct base paths
• Netlify deploy produces working URLs at existing paths

Note: Obviously this is a PR which was opened against, what I would consider, a source-available repo that is not commonly open for PRs, so feel free to close if you want, no hurt feelings! 😁

[afonsojramos]

Another note: The per-deck package.json files could be eliminated entirely if the folder structure matched the semantic URL paths, i.e., renaming 2024-12-07/ to 2024/feday/ (or nesting as 2024/feday/).

With that change:

slidev-decks build --all would use the folder name as the base path automatically — no per-deck build scripts needed
redirects.ts could derive paths from the folder structure instead of parsing build scripts
The pnpm workspace config (*/src) and all 35 per-deck package.json files could be dropped
The repo would go from a pnpm monorepo to a flat multi-deck setup managed entirely by slidev-decks

The trade-off is a one-time rename of all 37 folders + updating netlify.toml redirects. The date-based redirects (/2024-12-07 → /2024/feday/) would still work since redirects.ts can generate those from folder names.