Easier navigation across the site

What changed

A few existing pages were orphans — reachable only via the footer, or not
linked anywhere at all. We fixed discoverability on the public site:

The top-nav Features item now opens the full Features page (Feature → Advantage → Benefit) instead of just scrolling to a homepage section.
Added a ScaleMachine item to the top navigation (desktop and mobile menu).
The Install MCP page was a full orphan — it's now linked from the homepage footer and the shared site footer.
Footer "Product" sections now also list ScaleMachine and Install MCP.
Our Chrome extension landing (FB Ads Scraper Pro) is now linked from the homepage — previously it wasn't reachable from the main site at all.

Every public page is now reachable within one click from the homepage, so
nothing important stays hidden behind a missing link.