Horiseon Refactor

Refactoring HTML and CSS for existing Horiseon page.

Description

-Fixed broken navigation links

-Cleaned up code, added comments to separate the different sections and styles on the page.

-Consolidated CSS tags and properties to cut down on clutter in the stylesheet.

-Updated HTML to semantic tags.

-Added alt attributes to images.

-Re-ordered code so it makes sense top to bottom.

-Updated heading tags to make them sequential from top to bottom.

-Updated page title

-Added meta tags for the page description and viewport