Updates ACCAP logo and name in the web application

[BobTorgerson]

This PR updates the ACCAP logo and name in the web application.

Closes #70

[Copilot]

Pull request overview

This pull request updates the Alaska Center for Climate Assessment and Policy (ACCAP) branding to reflect a name change to Alaska Center for Climate Assessment and Preparedness, as requested in issue #70. The organization changed their name from "Policy" to "Preparedness" and provided a new logo to match.

Changes:

• Updated ACCAP name in footer text from "Policy" to "Preparedness"
• Replaced ACCAP logo SVG file with updated version
• Refreshed temperature index data (incidental change, not mentioned in PR description)

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
gui.py	Updated footer text to reflect ACCAP name change from "Policy" to "Preparedness"
assets/ACCAP_wide.svg	Complete replacement of ACCAP logo with new version
downloads/statewide_temperature_daily_index.csv	Data refresh - updated temperature index records (appears to be incidental to the logo/name update)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The changes to this CSV file appear to be a data refresh that is unrelated to the logo and name update described in the PR. The file shows updated temperature index data with dates shifted forward by approximately one year (from 2023-02-13 to 2024-02-23 start date, and from 2025-02-13 to 2026-02-23 end date).

Since this file is auto-generated by the application (see application.py lines 46-50), these changes suggest the file was regenerated when testing the logo/name changes. While this data refresh appears routine, it should be mentioned in the PR description to clarify that both logo/name updates AND data refresh are included in this PR.