Remove unused model of datatables

This model is required if we were doing server side processing for
fetching records however, we are not.
If this needs to be set up sometime in future, checkout:
https://datatables.net/examples/server_side/simple.html

app/models/datatable.rb

@@ -1,98 +0,0 @@
-# derived from http://railscasts.com/episodes/340-datatables
-# handles server side multi-column searching and sorting
-
-class Datatable
-  delegate :params, :h, :raw, :link_to, :number_to_currency, to: :@view
-
-  def initialize(klass, view)
-    @klass = klass
-    @view = view
-  end
-
-  def as_json
-    {
-        sEcho: params[:sEcho].to_i,
-        iTotalRecords: @klass.count,
-        iTotalDisplayRecords: items.total_entries,
-        aaData: data
-    }
-  end
-
-  def data
-    []
-  end
-
-  def columns
-    []
-  end
-
-  private
-
-  def items
-    @items ||= fetch_items
-  end
-
-  def fetch_items
-    items = filtered_list
-    items = selected_columns(items)
-    items = items.order(sort_order)
-    items = items.page(page).per_page(per_page)
-    if params[:sSearch].present?
-      items = items.where(quick_search)
-    end
-    items
-  end
-
-  def filtered_list
-    @klass.scoped
-  end
-
-  def selected_columns items
-    items
-  end
-
-  def quick_search
-    search_for = params[:sSearch].split(' ')
-    terms = {}
-    which_one = -1
-    criteria = search_for.inject([]) do |mem, atom|
-      which_one += 1
-      terms["search#{which_one}".to_sym] = "%#{atom}%"
-      mem << "(#{search_cols.map{|col| "#{col} like :search#{which_one}"}.join(' or ')})"
-    end.join(' and ')
-    [criteria, terms]
-  end
-
-  def page
-    params[:iDisplayStart].to_i/per_page + 1
-  end
-
-  def per_page
-    params[:iDisplayLength].to_i > 0 ? params[:iDisplayLength].to_i : 10
-  end
-
-  def sort_order
-    colnum = 0
-    sort_by = []
-    while true
-      break if !sorted?(colnum)
-      sort_by << "#{sort_column(colnum)} #{sort_direction(colnum)}"
-      colnum += 1
-    end
-    sort_by.join(', ')
-  end
-
-  def sorted? index=0
-    !params["iSortCol_#{index}"].nil?
-  end
-
-  def sort_column index=0
-    index = "iSortCol_#{index}"
-    columns[params[index].to_i]
-  end
-
-  def sort_direction index=0
-    index = "sSortDir_#{index}"
-    params[index] == 'desc' ? 'desc' : 'asc'
-  end
-end