Implement Hello World HTML Page

[traali]

This PR implements a simple Hello World HTML page according to specifications.

Implementation Details:

• Created hello.html with proper HTML5 structure
• Included required meta tags (charset and viewport)
• Set page title to 'Hello World Page'
• Added 'Hello World' text in h1 tags
• Ensured proper indentation and UTF-8 encoding

The implementation follows HTML5 standards and meets all technical requirements.