Add a basic journaling/blogging system

_layouts/post.html

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+---
+layout: default
+---
+
+<a href="/journal">Back</a>
+
+{{ content }}

_posts/2025-07-18-hello-world.md

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+---
+title: "Hello World"
+layout: post
+---
+# Welcome
+
+**Hello world**, this is my first Jekyll blog post.
+
+I hope you like it!

journal.html

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+---
+title: "Journal"
+layout: default
+---
+
+<h1>Journal</h1>
+
+{% assign posts_by_month = site.posts | group_by_exp: "post", "post.date | date: '%B %Y'" %}
+{% for month in posts_by_month %}
+  <h2>{{ month.name }}</h2>
+  <ul>
+    {% for post in month.items %}
+      <li>
+        <time>{{ post.date | date: "%Y.%m.%d" }}</time>
+        <a href="{{ post.url }}">{{ post.title }}</a>
+      </li>
+    {% endfor %}
+  </ul>
+{% endfor %}