minor: Update intro + social links

Author: jaceklaskowski

docs/index.md

@@ -13,8 +13,9 @@ Welcome to **The Internals of {{ book.title }}** online book! 🤙
 I'm [Jacek Laskowski](https://pl.linkedin.com/in/jaceklaskowski), a Freelance Data(bricks) Engineer specializing in
 [Apache Spark](https://books.japila.pl/apache-spark-internals/) (incl. [Spark SQL](https://books.japila.pl/spark-sql-internals/) and [Spark Structured Streaming](https://books.japila.pl/spark-structured-streaming-internals/)),
 [Delta Lake](https://books.japila.pl/delta-lake-internals/),
-[Databricks](https://www.databricks.com/),
-and [Apache Kafka](https://books.japila.pl/kafka-internals/) (incl. [Kafka Streams](https://books.japila.pl/kafka-streams-internals/)) with brief forays into a wider data engineering space (e.g., [Trino](https://trino.io/), [Dask](https://www.dask.org/) and [dbt](https://www.getdbt.com/), mostly during [Warsaw Data Engineering](https://www.meetup.com/Warsaw-Data-Engineering/) meetups).
+[Unity Catalog](https://www.unitycatalog.io/),
+[MLflow](https://mlflow.org/),
+[Databricks](https://www.databricks.com/) with brief forays into a wider data engineering space (mostly during [Warsaw Data Engineering](https://www.meetup.com/Warsaw-Data-Engineering/) meetups).
 
 I'm very excited to have you here and hope you will enjoy exploring the internals of {{ book.title }} as much as I have.
 

mkdocs.yml

@@ -136,14 +136,12 @@ extra:
   social:
     - icon: fontawesome/brands/github
       link: https://github.com/jaceklaskowski
-    - icon: fontawesome/brands/twitter
-      link: https://twitter.com/jaceklaskowski
+    - icon: fontawesome/brands/bluesky
+      link: https://bsky.app/profile/books.japila.pl
     - icon: fontawesome/brands/linkedin
       link: https://linkedin.com/in/jaceklaskowski
     - icon: fontawesome/brands/medium
       link: https://jaceklaskowski.medium.com
-    - icon: fontawesome/brands/mastodon
-      link: https://fosstodon.org/@jaceklaskowski
   spark:
     version: 3.5.3
   spark4: