fix(webapp): centre the landing attribution on mobile

The copy beside it already switches to centred below md, so the institutional
logos were the only part of the section still sitting left on a phone.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017VKWqbmrPJFv8aKZBp36uD

Author: FelixTJDietrich

webapp/src/components/info/landing/LandingProjectOriginsSection.tsx

@@ -16,7 +16,9 @@ export function LandingProjectOriginsSection() {
 						Technologies at the Technical University of Munich.
 					</p>
 				</div>
-				<InstitutionalAttribution />
+				<div className="justify-self-center md:justify-self-auto">
+					<InstitutionalAttribution />
+				</div>
 			</div>
 		</section>
 	);