Code Insights: Add dynamic code insight example for the in-product landing page

Created by: vovakulikov

Clone of https://github.com/sourcegraph/sourcegraph/pull/30541 since https://github.com/sourcegraph/sourcegraph/pull/30541#issuecomment-1031360338 has a CLA issue we re-created this PR in this new feature branch.

Close https://github.com/sourcegraph/sourcegraph/issues/30113

Context

This PR adds the first section for the in-product landing page - the Dynamic code insights demo chart. Desings

Desktop	Mobile (mid size tablet)