feat(blog): warn duplicate and inline authors (#10224)

Co-authored-by: OzakIOne <OzakIOne@users.noreply.github.com>
Co-authored-by: sebastien <lorber.sebastien@gmail.com>

website/blog/2018/04-30-How-I-Converted-Profilo-To-Docusaurus.mdx

@@ -1,9 +1,6 @@
 ---
 title: How I Converted Profilo to Docusaurus in Under 2 Hours
-author: Christine Abernathy
-authorURL: http://twitter.com/abernathyca
-authorImageURL: https://github.com/caabernathy.png
-authorTwitter: abernathyca
+authors: [abernathyca]
 tags: [profilo, adoption]
 ---
 

website/blog/2018/09-11-Towards-Docusaurus-2.mdx

@@ -1,10 +1,6 @@
 ---
 title: Towards Docusaurus 2
-author: Endilie Yacop Sucipto
-authorTitle: Maintainer of Docusaurus
-authorURL: https://github.com/endiliey
-authorImageURL: https://github.com/endiliey.png
-authorTwitter: endiliey
+authors: endiliey
 tags: [new, adoption]
 ---
 

website/blog/2021/11-21-algolia-docsearch-migration/index.mdx

@@ -1,13 +1,6 @@
 ---
 title: DocSearch migration
-authors:
-  - name: Clément Vannicatte
-    title: Software Engineer @ Algolia
-    url: https://github.com/shortcuts
-    image_url: https://github.com/shortcuts.png
-    twitter: sh0rtcts
-  - key: slorber
-
+authors: [shortcuts, slorber]
 tags: [search]
 image: ./img/social-card.png
 ---

website/blog/authors.yml

@@ -43,3 +43,23 @@ Josh-Cena:
   url: https://joshcena.com/
   image_url: https://github.com/josh-cena.png
   email: sidachen2003@gmail.com
+
+endiliey:
+  name: Endilie Yacop Sucipto
+  title: Maintainer of Docusaurus
+  url: https://github.com/endiliey
+  image_url: https://github.com/endiliey.png
+  twitter: endiliey
+
+abernathyca:
+  name: Christine Abernathy
+  url: http://twitter.com/abernathyca
+  image_url: https://github.com/caabernathy.png
+  twitter: abernathyca
+
+shortcuts:
+  name: Clément Vannicatte
+  title: Software Engineer @ Algolia
+  url: https://github.com/shortcuts
+  image_url: https://github.com/shortcuts.png
+  twitter: sh0rtcts