story-content, logs-content: Changed text width from 75 to 90 characters, added grouping of multipart log posts, and darkened background.

marko/page/logs-content/components/page/index.marko

@@ -16,12 +16,13 @@
         so you can still read it (or back it up) before leaving the page.
       </p>
     </annotation>
-    <post for(post in state.log.posts)
+    <post for(post in state.log.posts | status-var=loop)
           key=post.id
           on-move("movePost", post)
           on-remove("removePost", post)
           on-edited("postEdited")
           user=input.user
+          prev=(state.log.posts[loop.getIndex() - 1] || {})
           post=post
           characters=state.log.characters
           last=(post.position === state.log.posts.length)

marko/page/logs-content/components/page/style.less

@@ -1,6 +1,6 @@
 div.logs-content {
   width: 90%;
-  max-width: 75ch;
+  max-width: 95ch;
   margin: auto;
 
   div.header {