add link to my progress app

Author: zuzhi

themes/pico/css/blog.css

@@ -2,6 +2,13 @@ main {
   width: 400px;
 }
 
+/* Styles for mobile screens */
+@media (max-width: 600px) {
+  main {
+    width: 100%;
+  }
+}
+
 .footnotes li,
 .footnotes p {
   font-size: .8em;

themes/pico/html/base.html

@@ -27,6 +27,7 @@ <h4>
                 <a href="/" id="home">zuzhi</a>
                 <a href="/archives.html">archives</a>
                 <a href="/til.html">til</a>
+                <a href="https://progress.huzuzhi.com">progress</a>
                 <a href="https://github.com/zuzhi">github</a>
                 <a href="https://x.com/huzuzhi">x</a>
             </h4>