Revert "Update logo code in README (#1475)" (#1480)

This reverts commit ab0d900f81.

README.md

@@ -1,8 +1,5 @@
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="/docs/logo/readme-dark.svg">
-  <source media="(prefers-color-scheme: light)" srcset="/docs/logo/readme-light.svg">
-  <img alt="ViewComponent logo" src="/docs/logo/readme-light.svg">
-</picture>
+![ViewComponent logo](/docs/logo/readme-light.svg#gh-light-mode-only)
+![ViewComponent logo](/docs/logo/readme-dark.svg#gh-dark-mode-only)
 
 A framework for building reusable, testable & encapsulated view components in Ruby on Rails.