Add Acme Tools static pages

[sh962214-hub]

Closes #9

Summary:

• Adds index.html, about.html, and contact.html at the project root.
• Includes the exact required headings, paragraphs, and relative navigation links.
• Uses basic HTML structure with doctype, html, head, title, and body on each page.
• No JavaScript or external dependencies added.

Validation:

• Manually checked all three files exist at the root.
• Verified required text and relative links in each page with Select-String.