chore: move playground outside of pnpm workspace

Squashed commit of the following:

commit c9b7088
Author: Wojtek Majewski <wojciech.majewski@pm.me>
Date:   Sun May 4 12:33:02 2025 +0200

    chore: update pnpm workspace configuration to refine package inclusion patterns

    - Removed redundant empty lines and commented-out entries from pnpm-workspace.yaml
    - Adjusted package globs to better specify included and excluded directories

commit 1d527cb
Author: Wojtek Majewski <wojciech.majewski@pm.me>
Date:   Sun May 4 12:31:43 2025 +0200

    chore: remove configuration and migration files for deprecated setup

    - Deleted VSCode settings and extensions files in basic-flows example
    - Removed package.json, .gitignore, and other dev environment configs
    - Cleared Supabase configuration files and migration scripts related to initial setup
    - Removed function definitions and TypeScript files for sequential flow
    - Deleted migration SQL scripts and related schema setup
    - Cleaned up project to reflect deprecation of previous setup and prepare for new structure

Author: jumski