Remove Journal and Insights from the sidebar

[timsu]

[sweep-ai-deprecated]

@timsu I have started working on this PR to remove Journal and Insights from the sidebar.

Based on the files you provided, it looks like the main changes will be:

• Removing the Journal and Insights links from AppSidebar
• Removing the DB_JOURNAL and DB_INSIGHTS paths
• Removing the Journal screen component

Give me a minute! I'll make these changes and push up a PR for your review.

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