Add a two hacky classes to make the old part of website still readable

Author: hasparus

src/app/conf/2025/page.tsx

@@ -23,7 +23,7 @@ export default function Page() {
         <RegisterToday className="md:mb-8 md:mt-24" />
         <WhatToExpectSection className="md:mb-8 md:mt-24" />
       </div>
-      <div className="container my-20 flex flex-col gap-20 md:my-32 md:gap-32">
+      <div className="container my-20 flex flex-col gap-20 md:my-32 md:gap-32 [.light_&_.text-white]:text-neu-900 [.light_&_[alt='Grafbase_logo']]:invert">
         <Sponsors />
         <Sponsor />
         <Speakers />