Drop the dead #blog link and relabel the News initial

309cd7a renamed the blog area to #news but left the Tips header's
"All posts" link pointing at #blog, which no longer exists on the page,
and left the section initial reading B from "Blog". Both now match the
three-area contract: no anchor to a section that is gone, and the News
area is labelled N.

index.html

@@ -72,7 +72,6 @@
     <header class="section-head">
       <span class="initial" aria-hidden="true">T</span>
       <h2 class="section-title" id="tips-title"><span class="kicker">The latest in</span> <em>Tips &amp; Tricks</em></h2>
-      <a class="more" href="#blog">All posts</a>
     </header>
 
     <div class="feed-tools">
@@ -86,7 +85,7 @@
 
   <section class="section" id="news" aria-labelledby="news-title">
     <header class="section-head">
-      <span class="initial" aria-hidden="true">B</span>
+      <span class="initial" aria-hidden="true">N</span>
       <h2 class="section-title" id="news-title"><span class="kicker">The latest in</span> <em>News</em></h2>
       <a class="more" href="#modules">Modules</a>
     </header>