Add TP6 to the welcome mail landing page

Author: smelc

slides/index.md

@@ -16,11 +16,11 @@ And the list of TPs (_travaux pratiques_):
 1. [URL filtering](https://github.com/smelc/tn-fp-haskell-course/blob/main/tps/TP3.hs)
 1. [Arithmetic evaluator, tested against python3](https://github.com/smelc/tn-fp-haskell-course/blob/main/tps/TP4.hs)
 1. [Consuming GitHub API, display data in web server](https://github.com/smelc/tn-fp-haskell-course/blob/main/tps/TP5.hs)
+1. [Implement a Pong game using OpenGL](https://github.com/smelc/tn-fp-haskell-course/blob/main/tps/TP6.hs)
 
-This course is part of module _Architecture Logicielle_. It will be evaluated
-within this module: a subset of the evaluation will be dedicated to Functional
-Programming. Evaluation will either concern the lessons above or ask
-to write code akin to the content of the _TPs_.
+The exam will last two hours and
+will concern both the lessons above and be about writing
+code akin to the content of the _TPs_.
 
 This course is on GitHub: [smelc/tn-fp-haskell-course](https://github.com/smelc/tn-fp-haskell-course).
 Please suggest improvements and fix typos by doing [merge requests](https://docs.github.com/en/github/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).