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

lib/pages/posts.ex

@@ -0,0 +1,28 @@
+defmodule Llmex.Pages.Posts do
+  use Tableau.Page,
+    layout: Llmex.IndexLayout,
+    permalink: "/posts"
+  use Phoenix.Component
+
+  def template(assigns) do
+    ~H"""
+    <section class="posts-archive">
+      <p>
+        Browse through our collection of articles on Elixir, functional programming,
+        web development, and software engineering best practices.
+      </p>
+    </section>
+
+    <section class="posts-filter">
+      <h3>Categories</h3>
+      <div class="category-tags">
+        <a href="/posts" class="category-tag active">All Posts</a>
+        <a href="/posts/elixir" class="category-tag">Elixir</a>
+        <a href="/posts/phoenix" class="category-tag">Phoenix</a>
+        <a href="/posts/functional-programming" class="category-tag">Functional Programming</a>
+        <a href="/posts/web-development" class="category-tag">Web Development</a>
+      </div>
+    </section>
+    """
+  end
+end