Add dynamic home page copy

[Ulthran]

Summary

• Update home page with detailed description and isolate statistics
• Add database queries for isolate, patient, and sample counts

Testing

• black .
• pytest tests/ (fails: ModuleNotFoundError: No module named 'langchain_core.tracers._streaming')

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https://chatgpt.com/codex/tasks/task_e_689bccc5fa98832397402d69acede45d

[Copilot]

Pull Request Overview

This PR updates the home page with a detailed description of the microbial ARC isolate database and adds dynamic statistics. The changes provide users with context about the database's purpose and current data volumes.

Key changes:

• Replace static home page content with detailed description of the microbial ARC isolate database
• Add database queries to display live counts of isolates, patients, bacteremia, and nares samples
• Enhance query page with a help tooltip for the Custom Query field

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
app/app.py	Add database queries to fetch isolate, patient, bacteremia, and nares counts for the home page
app/templates/index.html	Replace static content with detailed description and dynamic statistics display
app/templates/query.html	Add informational popover tooltip to the Custom Query label

Comments suppressed due to low confidence (1)

app/templates/index.html:9

• There is an unnecessary comma before the isolate count. It should be 'currently holds {{ isolate_count }} isolates' without the comma.

    Children’s Hospital of Philadelphia. The database currently holds, {{ isolate_count }} isolates from

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