Beta docs for dbt Explorer phase 1

[nghi-ly]

What are you changing in this pull request and why?

Create beta docs for dbt Explorer phase 1

• Add tile for Explorer on https://docs.getdbt.com/docs/cloud/about-cloud/dbt-cloud-features
• Avoid confusion by removing last section on https://docs.getdbt.com/reference/node-selection/graph-operators since a star (*) is not technically a graph operator
• Add new page "Explore your dbt projects" under collaborate directory

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Needs review from PM

Adding new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

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[cafzal]

looks good! thanks @nghi-ly ! to dos in late sept:

• we'll add the new section on "multi-project exploration" soon covering the new mesh features.
• I'll re-do the demo videos with the latest & greatest

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Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 13, 2023 6:16pm