views: remove tag size indicator bars from /tags.

Remove tag size indicator bars. These bars don't play nicely with dark
mode and aren't all that useful to begin with.

app/helpers/tags_helper.rb

@@ -37,10 +37,4 @@ module TagsHelper
 
     html.html_safe
   end
-  
-  def tag_post_count_style(tag)
-    @highest_post_count ||= Tag.highest_post_count
-    width_percent = Math.log([tag.post_count, 1].max, @highest_post_count) * 100
-    "background: linear-gradient(to left, #DDD #{width_percent}%, white #{width_percent}%)"
-  end
 end

app/models/tag.rb

@@ -91,12 +91,6 @@ class Tag < ApplicationRecord
     extend ActiveSupport::Concern
 
     module ClassMethods
-      def highest_post_count
-        Cache.get("highest-post-count", 4.hours) do
-          select("post_count").order("post_count DESC").first.post_count
-        end
-      end
-
       def increment_post_counts(tag_names)
         Tag.where(:name => tag_names).update_all("post_count = post_count + 1")
       end

app/views/tags/index.html.erb

@@ -12,7 +12,7 @@
       <tbody>
         <% @tags.each do |tag| %>
           <tr>
-            <td style="<%= tag_post_count_style(tag) %>"><%= tag.post_count %></td>
+            <td><%= tag.post_count %></td>
             <td class="category-<%= tag.category %>">
               <%= link_to("?", show_or_new_wiki_pages_path(:title => tag.name)) %>
               <%= link_to(tag.name, posts_path(:tags => tag.name)) %>