feat: apply RichText to content sections and experience cards

ExperienceCard description switches from a plain <p> to RichText so
rich-text HTML from PocketBase renders correctly. BioSection and
IntroSection drop the prose class overrides — RichText handles
typography consistently.

src/widgets/BioSection/ui/BioSection/BioSection.tsx

@@ -14,5 +14,5 @@ export default async function BioSection() {
     notFound();
   }
 
-  return <RichText html={data.content} className="prose prose-lg max-w-none" />;
+  return <RichText html={data.content} />;
 }