supabase / supabase / 28879470413

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chore: replace concurrently with npm-run-all in docs and design-system (#47697)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Chore / dependency cleanup.

## What is the current behavior?

`apps/docs` and `apps/design-system` use the `concurrently` package to
run their parallel dev scripts, while the rest of the monorepo (e.g.
`packages/pg-meta`) already relies on `npm-run-all`.

## What is the new behavior?

Both apps now use `npm-run-all` (`run-p`), and `concurrently` is dropped
from their dependencies and the lockfile; `apps/docs` keeps its
kill-on-exit behavior via `run-p --race`, and `apps/design-system`'s
`dev:full` is collapsed into `dev` using the `run-p dev:*` glob (with
`dev:next`/`dev:content` sub-tasks and README updated to match).

## Additional context

N/A

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Updated design system setup instructions to reflect the new
development workflow and MDX watching behavior.
* **Chores**
* Simplified local development scripts for the design system and docs
apps.
* Split the dev workflow into separate commands for the app server and
content watcher, making it easier to run and troubleshoot.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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