Update cms-kontent example to action PR feedback

* Updates the `cms-kontent` example `Image` component to implement the
  suggested improvements from @styfle in vercel#37188.
* Simplifies the Kontent loader host checking.
* Reduces the default image quality to from `100` to `75`.
* Add `tslib` dependency to fix `Module not found: Can't resolve 'tslib'`
  error when importing `transformImageUrl` in the `Image` component.
  It looks like this might be a bug in v11 of the Kontent Delivery SDK,
  as it appears `tslib` needs to be included as dependency, rather than
  dev dependency. I missed this originally as the example runs fine in
  the Next repo as the root `yarn.lock` has `tslib`. It's only when the
  example is used via `yarn create next-app` that the issue occurs. We
  can likely remove this in future alongside an upgrade to the SDK
  package once this issue has been fixed and released there.

vercel#37188

examples/cms-kontent/components/image.js

@@ -1,22 +1,20 @@
 import NextImage from 'next/image'
 import { transformImageUrl } from '@kentico/kontent-delivery'
 
-const KONTENT_ASSET_HOSTNAME_REGEX = /.kc-usercontent.com$/
-
 const getLoader = (src) => {
   return srcIsKontentAsset(src) ? kontentImageLoader : undefined
 }
 
 const srcIsKontentAsset = (src) => {
   try {
     const { hostname } = new URL(src)
-    return KONTENT_ASSET_HOSTNAME_REGEX.test(hostname)
+    return hostname.endsWith('.kc-usercontent.com')
   } catch {
     return false
   }
 }
 
-const kontentImageLoader = ({ src, width, quality = 100 }) => {
+const kontentImageLoader = ({ src, width, quality = 75 }) => {
   return new transformImageUrl(src)
     .withWidth(width)
     .withQuality(quality)

examples/cms-kontent/package.json

@@ -14,7 +14,8 @@
     "react": "^18.1.0",
     "react-dom": "^18.1.0",
     "remark": "14.0.2",
-    "remark-html": "15.0.1"
+    "remark-html": "15.0.1",
+    "tslib": "2.4.0"
   },
   "devDependencies": {
     "autoprefixer": "10.4.7",