feat: add static analytics site generator for HCA Data Portal

[MillenniumFalconMechanic]

Ticket

Closes #3033

Summary

• Add analytics/generate_static_site.py script that calls the shared analytics package to generate a static HTML dashboard with GA4 data for the HCA Data Portal
• Add GitHub Actions workflow to deploy the generated site to GitHub Pages
• Add .credentials/ to .gitignore and update analytics package dependency to include static site support

The script uses the hostname filter (data.humancellatlas.org) to scope data to the portal only (the GA4 property is shared with the explorer), with an analytics start date of 2024-02-01 when the hostname split became reliable.

Test plan

• Generated site locally and verified dashboard renders correctly
• Verify GitHub Pages deployment works via workflow_dispatch

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a static analytics dashboard for the HCA Data Portal, checks in a generated site snapshot, and introduces GitHub Pages deployment for publishing the dashboard.

Changes:

• Add analytics/generate_static_site.py to build a portal-branded static analytics site from the shared analytics package.
• Commit the generated site HTML plus JSON data artifacts for the current report snapshot.
• Add a Pages deployment workflow, ignore local credentials, and update the analytics package dependency.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
analytics/site/index.html	Static dashboard shell and client-side rendering logic.
analytics/site/data/search_queries.json	Generated search-query analytics snapshot.
analytics/site/data/pageviews.json	Generated top-page analytics snapshot.
analytics/site/data/outbound_links.json	Generated outbound-link analytics snapshot.
analytics/site/data/monthly_traffic.json	Generated monthly traffic history snapshot.
analytics/site/data/meta.json	Generated report metadata for the snapshot.
analytics/site/data/filter_selected.json	Generated filter-event data snapshot.
analytics/site/data/file_downloads.json	Generated direct-download data snapshot.
analytics/site/data/file_download_events.json	Generated file-download event totals snapshot.
analytics/site/data/custom_events.json	Generated custom-event summary snapshot.
analytics/site/data/config.json	Runtime branding/config for the static site.
analytics/site/data/access_requests.json	Generated access-request data snapshot.
analytics/requirements.txt	Updates the shared analytics package source.
analytics/generate_static_site.py	New script to generate the static site.
analytics/constants.py	Advances analytics reporting month constants.
.gitignore	Ignores local credentials directory.
.github/workflows/deploy-analytics.yml	Adds GitHub Pages deployment workflow.

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 17 changed files in this pull request and generated 6 comments.

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