fix: rename footer.tsx to index.tsx

[jorgemoya]

What/Why?

Simple oversight since we use index for the rest of the component files.

Testing

No change.

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[github-actions]

⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-canary-pknx0r150-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟢 Performance	100
🟢 Accessibility	92
🟠 Best practices	78
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟠 Performance	82
🟢 Accessibility	92
🟠 Best practices	78
🟠 SEO	85