Enhance Success Message in Authentication Page

[arnvjshi]

Description

This pull request updates the success.html file in the authentication flow.
The change modifies the success message header by emphasizing it with an additional exclamation mark (Authentication Successful!!) to improve visibility and make the success state more noticeable to users.

Related Tickets & Documents

N/A

Mobile & Desktop Screenshots/Recordings

Before:
Authentication Successful

After:
Authentication Successful!!

Steps to QA

1. Complete an authentication flow.
2. On success, confirm that the message now reads “Authentication Successful!!”.
3. Verify that the redirect to [OpenSauced](https://app.opensauced.pizza/) still works as expected.

Tier (staff will fill in)

• Tier 1
• Tier 2
• Tier 3
• Tier 4

[github-actions]

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Issue Reference

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Protected Branch

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Conventional Commit PR Title

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• docs: correct typo in README
• feat: implement dark mode"
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Linting Errors

• Found type "null", must be one of "feat","fix","docs","style","refactor","perf","test","build","ci","chore","revert"
• No subject found