Add pg's tweet to pro page

app/views/welcome/subscribe.html.haml

@@ -113,6 +113,16 @@
           %li
             %i.fa.fa-check
             Year in Review
+
+        %div{style: "margin-top: 25px;"}
+          %blockquote.twitter-tweet{data: {theme: "light"}}
+            %p{lang: "en", dir: "ltr"}
+              The pro version of
+              %a{href: "https://t.co/a4GV5f69A1"} https://t.co/a4GV5f69A1
+              costs $3 a month, and it is worth so much more than that.
+            — Paul Graham
+            %a{href: "https://twitter.com/paulg/status/1746341562286539118?ref_src=twsrc%5Etfw"} January 14, 2024
+          = javascript_include_tag "https://platform.twitter.com/widgets.js", async: true, charset: "utf-8"
 %br
 %br
 %br