Remove 'hello' extension (#10741)

hello/GEMINI.md

@@ -1,8 +0,0 @@
-# Ink Library Screen Reader Guidance
-
-When building custom components, it's important to keep accessibility in mind. While Ink provides the building blocks, ensuring your components are accessible will make your CLIs usable by a wider audience.
-
-## General Principles
-
-Provide screen reader-friendly output: Use the useIsScreenReaderEnabled hook to detect if a screen reader is active. You can then render a more descriptive output for screen reader users.
-Leverage ARIA props: For components that have a specific role (e.g., a checkbox or a button), use the aria-role, aria-state, and aria-label props on <Box> and <Text> to provide semantic meaning to screen readers.

hello/gemini-extension.json

@@ -1,5 +0,0 @@
-{
-  "name": "context-example",
-  "version": "1.0.0",
-  "contextFileName": "GEMINI.md"
-}