Simplify nav: drop Spectrum and Hardware links

Sections remain on the page, reachable by scrolling; nav is now
Features / How it's built / Partners / Contribute / Support.

Author: patj

index.html

@@ -23,8 +23,6 @@
       </a>
       <nav class="nav-links">
         <a href="#features">Features</a>
-        <a href="#spectrum">Spectrum</a>
-        <a href="#hardware">Hardware</a>
         <a href="#built">How it's built</a>
         <a href="#partners">Partners</a>
         <a href="#contribute">Contribute</a>