Update tutorials list, fix #850

Author: michielbdejong

for-developers.html

@@ -35,12 +35,12 @@ <h2 property="schema:name">Developer Tutorials</h2>
               <p>See the tutorials below to support you in building a Solid app.</p>
 
               <ul>
-                <li><a href="">Java tutorial</a> by Inrupt</li>
-                <li><a href="">Javascript tutorial</a> by Inrupt</li>
-                <li><a href="">Using LDO to build a Solid Application for React</a> by O.team</li>
-                <li><a href="">Creating Vocabularies</a> tutorial</li>
-                <li><a href="">How to Build a Solid To-Do App with React</a> tutorial by Virginia Balseiro</li>
-                <li><a href="">Ember Solid</a> by Nextcloud</li>
+                <li><a href="https://docs.inrupt.com/developer-tools/java/client-libraries/getting-started/">Java tutorial</a> by Inrupt</li>
+                <li><a href="https://docs.inrupt.com/developer-tools/javascript/client-libraries/tutorial/getting-started/">Javascript tutorial</a> by Inrupt</li>
+                <li><a href="https://ldo.js.org/guides/solid_react/">Using LDO to build a Solid Application for React</a> by O.team</li>
+                <li><a href="https://github.com/solid/solidproject.org/wiki/Vocabularies-Overview">Creating Vocabularies</a> tutorial</li>
+                <li><a href="https://virginiabalseiro.com/blogposts/tutorial-create-a-solid-to-do-app">How to Build a Solid To-Do App with React</a> tutorial by Virginia Balseiro</li>
+                <li><a href="https://nextcloud.hellofuture.be/s/nYYNwGceFSNotJY">Ember Solid</a> by Aad Versteden</li>
               </ul>
             </div>
           </section>