[WIP] Remove index.html from repository and add to .gitignore

[Copilot]

• Remove index.html from the repository
• Add index.html to .gitignore
• Verify the build still works correctly
• Verify index.html is generated after build

Original prompt

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This section details on the original issue you should resolve

<issue_title>index.html should not be included in the repo</issue_title>
<issue_description>Accidentally added in:

• [WIP] Add recently added and updated lists to index page #64

It should be removed and added to .gitignore.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #65

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Latest commit:	e7bfa21
Status:	✅  Deploy successful!
Preview URL:	https://62247f96.tools-b1q.pages.dev
Branch Preview URL:	https://copilot-remove-index-html-fi.tools-b1q.pages.dev

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