adding mathplus logo

portfolio-nuxt/pages/a_history_of_the_domino_problem.vue

@@ -221,11 +221,12 @@
         </SwiperSlide>
         <SwiperSlide data-hash="contributors" class="p-10 text-xl overflow-hidden">
             <div class="max-h-[calc(100vh-27rem)] overflow-auto">
-                <div class="grid grid-cols-4 p-5 items-center">
+                <div class="grid grid-cols-5 p-5 items-center">
                     <NuxtLink class="px-3" to='https://www.hu-berlin.de/en'><nuxt-img class="w-[100px]" src="/hdp_images/hu_logo.png"/></NuxtLink>
                     <NuxtLink class="px-3" to='https://www.km28.de/'><nuxt-img class="w-[100px]" src="/hdp_images/km28_logo.png"/></NuxtLink>
                     <NuxtLink class="px-3" to='https://www.ims-chips.com/'><nuxt-img class="w-[250px]" src="/hdp_images/ims_chips_logo.png"/></NuxtLink>
                     <NuxtLink class="px-3" to='https://www.akademie-solitude.de/'><nuxt-img class="w-[100px]" src="/hdp_images/akademie_schloss_solitude_logo.png"/></NuxtLink>
+                    <NuxtLink class="px-3" to='https://mathplus.de/'><nuxt-img class="w-[200px]" src="/hdp_images/mathplus_logo_gray.png"/></NuxtLink>
                 </div>
             </div>
         </SwiperSlide>