Modernize blog UI

Summary:
Cleans up some of the mess I made in D3694. Basically:

  - All blogs have an "internal" view with posts that uses mobile-friendly UIs, etc., so we don't have to do as much work with skins -- they just have to look pretty.
  - Blogs now have a separate "live" view that we use to handle domains / skins.
  - Simplified some views and use IDs in some URLs for consistency.
  - Delete a bunch of edge/blogger/multi-blog code that's now obsolete.

Test Plan: Will attach screenshots.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3695

src/aphront/configuration/AphrontApplicationConfiguration.php

@@ -140,7 +140,7 @@ abstract class AphrontApplicationConfiguration {
 
       try {
         $blog = id(new PhameBlogQuery())
-          ->setViewer($request->getUser())
+          ->setViewer(new PhabricatorUser())
           ->withDomain($host)
           ->executeOne();
       } catch (PhabricatorPolicyException $ex) {
@@ -161,18 +161,10 @@ abstract class AphrontApplicationConfiguration {
         );
       }
 
-      // 2 basic cases
-      // -- looking at a list of blog posts, path is nothing or '/'
-      //    -- we have to fudge the URI in this case
-      // -- looking at an actual blog post, path is like
-      // /phame/posts/<author>/post_title
-      // NOTE: it is possible to get other phame pages, we just do
-      // not link to them at this time.
-      if (!$path || $path == '/') {
-        $path = $blog->getViewURI();
-      }
+      // TODO: Make this more flexible and modular so any application can
+      // do crazy stuff here if it wants.
 
-      PhameBlog::setRequestBlog($blog);
+      $path = '/phame/blog/live/'.$blog->getID().'/'.$path;
 
       $celerity = CelerityAPI::getStaticResourceResponse();
       $celerity->setUseFullURI(true);