Remove QuoteIcon (#1730)

## What are you changing?

- Remove the QuoteIcon component, related tests and stories, and the
HeadlineSize type
- Extra bit: Fix the Logo README title, which was previously mistakenly
"QuoteIcon"

## Why?

- QuoteIcon and HeadlineSize are not used anywhere. DCR uses [its own
implementation](https://github.com/guardian/dotcom-rendering/blob/main/dotcom-rendering/src/components/QuoteIcon.tsx)
- We are moving format-related types into DCR
(guardian/dotcom-rendering#12461). Removing this component removes one
usage of format outside of DCR

.changeset/perfect-vans-obey.md

@@ -0,0 +1,5 @@
+---
+'@guardian/source-development-kitchen': major
+---
+
+Remove `QuoteIcon` component and `HeadlineSize` type

libs/@guardian/source-development-kitchen/src/react-components/index.test.ts

@@ -13,8 +13,6 @@ export type {
 	LogoProps,
 	NumericInput,
 	NumericInputProps,
-	HeadlineSize,
-	QuoteIconProps,
 	StarRatingProps,
 	ToggleSwitchProps,
 	ToggleSwitchAppsProps,
@@ -35,7 +33,6 @@ it('Should have exactly these exports', () => {
 		'Lines',
 		'Logo',
 		'NumericInput',
-		'QuoteIcon',
 		'SquigglyLines',
 		'StarRating',
 		'StraightLines',

libs/@guardian/source-development-kitchen/src/react-components/index.ts

@@ -27,9 +27,6 @@ export type { LineCount, LinesProps } from './lines/Lines';
 export { Logo } from './logo/Logo';
 export type { LogoProps } from './logo/Logo';
 
-export { QuoteIcon } from './quote-icon/QuoteIcon';
-export type { HeadlineSize, QuoteIconProps } from './quote-icon/QuoteIcon';
-
 export { StarRating } from './star-rating/StarRating';
 export type { StarRatingProps } from './star-rating/StarRating';
 

libs/@guardian/source-development-kitchen/src/react-components/logo/README.md

@@ -1,4 +1,4 @@
-# QuoteIcon
+# Logo
 
 The Guardian logo appears in the header on most editorial pages