use dsl for search definition and fix pagination

app/views/search/_form.slim

@@ -1,6 +1,6 @@
 = form_tag(search_path, method: :get)
   = text_field_tag(:q, params[:q], placeholder: 'Suche…', autofocus: true)
-  - if @show_filters
+  - if false #@show_filters
     fieldset
       legend Ergebnisse filtern
       .row

app/views/search/index.html.slim

@@ -2,13 +2,13 @@ div
   = render 'search/form'
 
 .clearfix
-  - if @show_search_result
+  - if params[:q].present?
     .left
-      | #{@papers_count} Treffer
+      | #{@papers.total} Treffer
     .right
       / button.button. TODO: Suche Abbonieren
   - else
-    | #{@papers_count} Dokumente in der Datenbank
+    | #{@papers.total} Dokumente in der Datenbank
 div
   ul.no-bullet
     - @papers.each do |doc|