Add mappable documentation pathnames

[EthanThatOneKid]

Changes

• Clean Pathnames: Implement cleaner documentation pathnames by using Array.prototype.map and node names from "#/lib/docs/nodes.ts" after sorting.
• Unified Playground URLs: Deprecate /playgrounds and migrate playgrounds to use /p/:id URLs for consistency.

Improvements

1. Clean Documentation Pathnames: We'll simplify documentation pathnames to remove unnecessary prefixes. This will improve readability for users.
2. Unified Playground URLs: We'll switch playgrounds to use a consistent URL format (/p/:id). This simplifies access and reduces confusion.

Resolves #9.