update developer page, rectify link - taler-www

commit d1b2d19ead0db0c0f91be325d268e3042b667be1
parent 35d573c00c699657384336c75a9a5ce31da4f4d9
Author: Stefan Kügel <stefan.kuegel@taler.net>
Date:   Wed,  7 Jan 2026 19:22:16 +0100

update developer page, rectify link

	taler-www Main taler.net website
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