[WIP] Update GitHub pages action to download data files only

[Copilot]

• Update .gitignore to exclude data directory from commits
• Create new GitHub Pages deployment workflow
• Modify update-gtfs.yml to upload data files as artifacts instead of committing
• Remove existing data files from git tracking
• Update README.md to reflect new workflow
• Verify workflow syntax and functionality
• Test local development still works

Original prompt

Build the GitHub pages in an action, and only download the data files + build them as artifacts, don't commit them in the repository. This is to reduce the size of the respository in the future.

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[Copilot]

Pull Request Overview

This PR restructures the GitHub workflow to optimize repository size by moving GTFS data processing from git commits to GitHub Pages artifacts. The changes implement a new deployment strategy where data files are generated during the Pages build process rather than being committed to the repository.

• Updated GTFS data workflow to create artifacts instead of committing files
• Created new GitHub Pages deployment workflow that downloads and processes data during build
• Modified documentation to reflect the new artifact-based approach

Reviewed Changes

Copilot reviewed 3 out of 14 changed files in this pull request and generated 2 comments.

File	Description
README.md	Updated documentation to describe new artifact-based data handling and daily processing schedule
.github/workflows/update-gtfs.yml	Converted from committing data files to uploading them as artifacts with reduced permissions
.github/workflows/deploy-pages.yml	New workflow for GitHub Pages deployment that processes GTFS data during build

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[Copilot]

The wildcard pattern 'icon-*.png' may fail if no matching files exist, causing the cp command to fail. Consider using a more robust approach or adding error handling to prevent build failures when icon files are missing.

Suggested change

	mkdir -p _site
	mkdir -p _site
	shopt -s nullglob