Updated logos (#165)

README.md

@@ -1,4 +1,5 @@
-![Firebase Genkit logo](docs/resources/genkit-logo.png 'Firebase Genkit')
+![Firebase Genkit logo](docs/resources/genkit-logo-dark.png#gh-dark-mode-only 'Firebase Genkit')
+![Firebase Genkit logo](docs/resources/genkit-logo.png#gh-light-mode-only 'Firebase Genkit')
 
 Firebase Genkit (beta) is a framework with powerful tooling to help app developers build, test, deploy, and monitor AI-powered features with confidence. Genkit is also built from the ground up to be cloud optimized and code-centric, designed to feel familiar to most developers with less new concepts to learn. The Genkit framework itself is free and [open source](./LICENSE), and integrates with many services that have free tiers to get started.
 

docs/index.md

@@ -3,7 +3,14 @@
 Firebase Genkit is an **open source framework** that helps you build, deploy,
 and monitor **production-ready** **AI-powered apps**.
 
-<img src="resources/genkit-logo.png" width="350px" height="197px" alt="Genkit logo" class="attempt-right">
+<picture class="attempt-right">
+  <source
+    srcset="/docs/genkit/resources/logo-vertical-dark.png"
+    media="(prefers-color-scheme: light)"
+    class="devsite-dark-theme"
+    alt="Genkit logo">
+  <img src="/docs/genkit/resources/logo-vertical-light.png" width="350px" height="197px" alt="Genkit logo">
+</picture>
 
 Genkit is **designed for app developers**, to help you easily integrate
 powerful AI capabilities into your apps with familiar patterns and paradigms.