feat(sponsors): add /sponsors page, homepage promo, and in-app strip

app/src/lib/sponsors.ts

@@ -0,0 +1,10 @@
+export type Sponsor = {
+  name: string;
+  url: string;
+  logoSrc: string;
+  logoAlt?: string;
+  /** Set true for solid-black logos that need to flip white in dark mode. */
+  invertOnDark?: boolean;
+};
+
+export const SPONSORS: Sponsor[] = [];