correct release

Author: mbostock

docs/observable.tmpl

@@ -37,7 +37,7 @@
         </a>
         <div style="display: flex; align-items: center; justify-self: end; gap: 1rem; font-size: 14px;">
           <a href="https://github.com/observablehq/notebook-kit/releases" style="color: inherit;">
-            2.0.0-alpha.1
+            1.0.0-alpha.7
           </a>
           <a href="https://github.com/observablehq/notebook-kit" style="color: inherit;">
             GitHub ★