add mono css framework, add some boiler plate, get started on responsive design fixes

lib/layouts/post_layout.ex

@@ -5,6 +5,19 @@ defmodule Llmex.PostLayout do
   def template(assigns) do
     ~H"""
     <%= {:safe, render(@inner_content)} %>
+    <%= if @page[:date] do %>
+      <time datetime={@page[:date]}><%= format_date(@page[:date]) %></time>
+    <% end %>
     """
   end
+
+  defp format_date(date_string) when is_binary(date_string) do
+    case Date.from_iso8601(date_string) do
+      {:ok, date} -> Calendar.strftime(date, "%B %d, %Y")
+      {:error, _} -> date_string
+    end
+  end
+
+  defp format_date(%Date{} = date), do: Calendar.strftime(date, "%B %d, %Y")
+  defp format_date(_), do: ""
 end