style: Update index.html and scroll.js

[sy-records]

Summary

• Remove unused formatUpdated config
• Sync index.html, Add pure.css and prism-php.min.js
• Fix variable top is redundant

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Repo settings
• Other, please describe:

If changing the UI of default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

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The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

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If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated
• Related tests have been updated

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[anikethsaha]

Can you add some description of the change?

Thanks

[Koooooo-7]

LGTM.