Convert notes to use percentages instead of exact coordinates

- This allows for the note boxes to be easily resized
-- Now resizing the note container resizes all of the note boxes
-- The z-index and position values had to be adjusted for this
--- So that the note/preview boxes were still visible
--- So that the image was selectable with right clicks
- All of the inner box styles have been moved to the outer box
-- Now the inner box is only a container for the note body
- The always resize image option has been removed from user settings
-- The value still exists on the model for future rename/reuse
- The max width is set at 100% for responsive mode to fit the screen

app/views/posts/partials/show/_options.html.erb

@@ -1,7 +1,4 @@
 <ul>
-  <li id="post-option-resize-to-window">
-    <%= link_to "Resize to window", "#", id: "image-resize-to-window-link" %>
-  </li>
   <li id="post-option-find-similar">
     <%= link_to "Find similar", iqdb_queries_path(post_id: post.id) %>
   </li>