feat: return adding author instructions to contribution guide

Author: f-hollow

content/pages/contribution-guide/writing-content/index.md

@@ -64,13 +64,30 @@ After you finish writing, revisit your summary to see if it needs any adjustment
 
 #### Add youself as an author
 
-The default Espressif author is used:
+To add yourself as an author, [create an article](#create-and-view-an-article) and follow the instructions in the article's `index.md` YAML header.
+
+If the article already exists and you want to edit the authors, here are the same instructions:
+
+- Create your author entry
+  - Create your page at `content/authors/<author-name>/_index.md`
+  - Add your personal data at `data/authors/<author-name>.json`
+- Add the following to your article's YAML header
+  ```yaml
+  authors:
+    - "<author-name>"        # List your name(s)
+  ```
+
+In some cases, it might be better to add the default Espressif author:
 
 - If the author prefers to stay anonymous
 - For posts generated by scripts, such as automatic compilations, release notes, and so on
 - For articles generated with AI
 
-In other cases, add yourself as an author. For this, follow the instructions in the article's YAML header.
+To add the default author, include this in your article's YAML header:
+```yaml
+showAuthor: true
+```
+
 
 ## Write the content