Docs: Update badly-migrated snippet

[kylegach]

What I did

Migration script did not correctly handle snippets with paths that had different filenames. So this fixes one known instance by splitting into two snippets.

Checklist for Contributors

Testing

Manual testing

Preview this branch in locally-run docs

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

Greptile Summary

The pull request addresses a migration issue in the documentation by splitting a snippet into two distinct parts for better clarity.

• docs/_snippets/angular-builder-production.md: Added two separate snippets for building Storybook with Angular's custom builder.
• docs/_snippets/custom-build-script-production.md: Deleted redundant file to maintain documentation accuracy.
• docs/sharing/publish-storybook.mdx: Modified to separate Angular build instructions into a distinct section, improving clarity and accuracy for users of different frameworks.

[greptile-apps]

LGTM

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