Remove dataset download links from footer

[ethan-CCY]

Motivation

• Remove the CSV/JSON download links exposed in the site footer to prevent direct downloading of the data files.
• Keep the rest of the UI and filtering functionality intact while removing only the exposed dataset links.

Description

• Deleted the footer download block that contained links to kaohsiung_parking_lots_2025-12-25_curated.csv and kaohsiung_parking_lots_2025-12-25_schema_placephoto_fallback.json.
• Updated index.html to remove the <footer class="site-footer"> section with the download links.
• Changes were committed with the message Remove dataset download links.

Testing

• No automated unit or integration tests were run because this is a static HTML change.
• An attempt to capture a page screenshot using Playwright failed due to a Chromium crash (SIGSEGV) while launching the headless browser.
• A local HTTP server was started with python -m http.server 8000 during testing attempts but no successful browser rendering was produced.

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Codex Task