revamp the way page:treehouse/new works

- treehouse/new is now a regular page, not a special template
- most of the code related to the `new` badge in page:index has been removed
- you're meant to discern between pages you've read vs ones you haven't by looking at the colors of the links (blue vs purple)

template/components/_head.hbs

@@ -18,7 +18,6 @@ clever to do while browser vendors figure that out, we'll just have to do a cach
 
 <script>
     const TREEHOUSE_SITE = `{{ config.site }}`;
-    const TREEHOUSE_NEWS_COUNT = {{ len feeds.news.branches }};
 
     {{!-- Yeah, this should probably be solved in a better way somehow.
     For now this is used to allow literate-programming.js to refer to syntax files with the ?cache attribute,
@@ -35,7 +34,6 @@ clever to do while browser vendors figure that out, we'll just have to do a cach
     import "treehouse/settings.js";
     import "treehouse/tree.js";
     import "treehouse/emoji.js";
-    import "treehouse/news.js";
 </script>
 
 <meta property="og:site_name" content="{{ config.user.title }}">

template/components/_nav.hbs

@@ -3,17 +3,3 @@
         {{{ include_static 'svg/object/logo.svg' }}}
     </a>
 </nav>
-
-{{!--
-
-I don't have any idea where to put this right now.
-There's no obvious place, and even when it is there, I hate the hideous red badge on new entries.
-No time to figure it out. Will do later.
-
-{{#if (eq page.tree_path 'index')}}
-<nav id="nav-links">
-    <a href="{{ config.site }}/treehouse/new" data-cast="new">new</a>
-</nav>
-{{/if}}
-
---}}