chore: update netlify configuration

[Dunqing]

Description

netlify already supports pnpm, refer to netlify/build-image#845

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[sapphi-red]

Thanks!

[sapphi-red]

@patak-dev
It seems it's specified in Netlify UI too. (that one is not used though)

1:02:56 PM: Different build command detected, going to use the one specified in the Netlify configuration file: 'pnpm ci-docs' versus 'npx pnpm i --store=node_modules/.pnpm-store --frozen-lockfile && npm run ci-docs' in the Netlify UI

https://app.netlify.com/sites/vite-docs-main/deploys/6350c85dbf5a600008d5600e

[patak-dev]

@sapphi-red thanks for the heads up, updated it to pnpm ci-docs. We could also leave it empty I think 🤔