add planB Tech School program

Author: AlphonseMehounme

index.html

@@ -67,6 +67,7 @@ <h2>Fellowship</h2>
               <li><a href="https://learning.chaincode.com/">Chaincode Labs</a></li>
               <li><a href="https://www.summerofbitcoin.org/">Summer of Bitcoin</a></li>
               <li><a href="https://btrust.homerun.co/btrust-builders-2025-oss-cohort-application/en">BOSS Program</a></li>
+              <li><a href="https://planb.network/en/courses/btc402">PlanB Tech School</a></li>
             </ul>
           </section>
           <section id="grants" class="ressourcebox">