docs: add link back to sizes and mention TailwindCSS

Author: atinux

docs/content/1.get-started/2.configuration.md

@@ -59,7 +59,7 @@ export default defineNuxtConfig({
 
 List of predefined screen sizes.
 
-These sizes will be used to generate resized and optimized versions of an image (for example, with the `sizes` modifier).
+These sizes will be used to generate resized and optimized versions of an image (for example, with the [`sizes`](/usage/nuxt-img#sizes) modifier).
 
 ```ts [nuxt.config.ts]
 export default defineNuxtConfig({
@@ -78,6 +78,10 @@ export default defineNuxtConfig({
 })
 ```
 
+::callout
+We share the same naming and sizes as [Tailwind CSS](https://tailwindcss.com/docs/responsive-design) and we added the `xs` property.
+::
+
 ## `domains`
 
 To enable image optimization on an external website, specify which domains are allowed to be optimized. This option will be used to detect whether a remote image should be optimized or not. This is needed to ensure that external urls can't be abused.