update: remove HashiDays alert banner

[pbortnick]

What

Make const ALERT_BANNER_ACTIVE false to remove HashiDays alert banner

Why

Screenshots

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Merge Checklist

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Pull Request

• One or more labels describe the type of change (e.g. clarification) and associated product (e.g. tfc).
• Description links to related pull requests or issues, if any.

Content

• Redirects have been added for moved, renamed, or deleted pages.
• Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• Links to related content where appropriate (e.g., API endpoints, permissions, etc.).
• Pages with related content are updated and link to this content when appropriate.
• New pages have metadata (page name and description) at the top.
• New images are 2048 px wide. They have HashiCorp standard annotation color (#F92672) and format (rectangle with rounded corners), blurred sensitive details (e.g. credentials, usernames, user icons), and descriptive alt text in the markdown for accessibility.
• New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• UI elements (button names, page names, etc.) are bolded.
• The Vercel website preview successfully deployed.

Reviews

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• I or someone else reviewed the content for typos, punctuation, spelling, and grammar.

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