Stop linking to the github wiki

Author: marijnh

doc/manual.html

@@ -79,9 +79,9 @@ <h2 style="position: relative">
     functionality. It does provide a rich API on top of which such
     functionality can be straightforwardly implemented. See
     the <a href="#addons">addons</a> included in the distribution,
-    and the <a href="https://github.com/codemirror/CodeMirror/wiki/CodeMirror-addons">list
-    of externally hosted addons</a>, for reusable
-    implementations of extra features.</p>
+    and <a href="https://npms.io/search?q=codemirror">3rd party
+    packages on npm</a>, for reusable implementations of extra
+    features.</p>
 
     <p>CodeMirror works with language-specific modes. Modes are
     JavaScript programs that help color (and optionally indent) text

index.html

@@ -171,11 +171,6 @@ <h2>Community</h2>
   that explicit, we have
   a <a href="http://contributor-covenant.org/version/1/1/0/">code of
   conduct</a> that applies to communication around the project.</p>
-
-  <p>A list of CodeMirror-related software that is not part of the
-  main distribution is maintained
-  on <a href="https://github.com/codemirror/CodeMirror/wiki/CodeMirror-addons">our
-  wiki</a>. Feel free to add your project.</p>
 </section>
 
 <section id=browsersupport>