feat(storyblok): add a content version parameter and the possibility of making a custom config

[cetuuus]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

For storyblok indexing, developers can choose the version of content they want to index (generally draft in development/staging and published in production). They can also set a custom configuration for retrieving stories.
This is required because currently we can only index content in draft state, and it will only index top-level pages (not those in folders). A bit annoying when you want to build a professional website.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

[cetuuus]

@Baroshem