docs(blog): implement blog (#1935)

* docs(blog): implement blog

This enables blog with a simple welcome to the blog post.

* docs(blog): add authors page

* chore(docusaurus): update docusaurus to v3.9.1

* docs(blog): add a description for each author

* docs(blog): refactor the image url for each author

* docs: update author name

Co-authored-by: Gauthier <mail@gauthierth.fr>

---------

Co-authored-by: Gauthier <mail@gauthierth.fr>

gen-docs/blog/2025-09-29-introducing-jellyseerr-blog.md

@@ -0,0 +1,24 @@
+---
+title: Welcome to the Jellyseerr Blog
+description: The official Jellyseerr blog for release notes, technical updates, and community news.
+slug: welcome
+authors: [fallenbagel, gauthier-th]
+tags: [announcement, jellyseerr, blog]
+image: https://raw.githubusercontent.com/fallenbagel/jellyseerr/refs/heads/develop/gen-docs/static/img/logo.svg
+hide_table_of_contents: false
+---
+
+We are pleased to introduce the official Jellyseerr blog.
+
+This space will serve as the central place for:
+
+- Release announcements
+- Updates on new features and improvements
+- Technical articles, such as details on our [**DNS caching package**](https://github.com/jellyseerr/dns-caching) and other enhancements
+- Community-related news
+
+<!--truncate-->
+
+Our goal is to keep the community informed and provide deeper insights into the ongoing development of Jellyseerr.
+
+Thank you for being part of the Jellyseerr project. More updates will follow soon.