adjust links to wiki's page for Extensions, Add-Ons, and Customizations

- remove redundant link from footer's Company column (still exists in Community)
- change link to point directly to wiki page instead of to a wiki redirect for:
   - static/features page ("3rd Party Tools" section)
   - static/extensions redirection

website/server/controllers/top-level/pages.js

@@ -81,7 +81,7 @@ api.redirectExtensionsPage = {
   url: '/static/extensions',
   runCron: false,
   async handler (req, res) {
-    return res.redirect('http://habitica.wikia.com/wiki/App_and_Extension_Integrations');
+    return res.redirect('http://habitica.wikia.com/wiki/Extensions,_Add-Ons,_and_Customizations');
   },
 };