improved Seaside loading instructions

Author: theseion

_projects/seaside.md

@@ -3,11 +3,13 @@ title:          Seaside
 img-src:        projects/seaside.png
 href:           https://github.com/SeasideSt/Seaside
 quick-install: >
-    Metacello new
+    "For Squeak >= 5.2"
+    Installer ensureRecentMetacello.
+    (Smalltalk at: #Metacello) new
         baseline:'Seaside3';
         repository: 'github://SeasideSt/Seaside:master/repository';
         load
 quick-install-notes: >
-    Make sure you have <a href="https://github.com/dalehenrich/metacello-work" target="_blank">Metacello</a> installed.
+    See <a href="https://github.com/SeasideSt/Seaside#install-in-squeak">the Github README</a> for more detailed installation instructions.
 ---
 A layered set of abstractions over HTTP and HTML, that let you build highly interactive web applications.