[MINOR] Intro (with links to new cool tools)

Author: jaceklaskowski

docs/index.md

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 Welcome to **The Internals of {{ book.title }}** online book! 🤙
 
-I'm [Jacek Laskowski](https://pl.linkedin.com/in/jaceklaskowski), an IT freelancer specializing in [Apache Spark](https://spark.apache.org/), [Delta Lake](https://delta.io/) and [Apache Kafka](https://kafka.apache.org/) (with brief forays into a wider data engineering space, e.g. [Trino](https://trino.io/) and [ksqlDB](https://ksqldb.io/), mostly during [Warsaw Data Engineering](https://www.meetup.com/Warsaw-Data-Engineering/) meetups).
+I'm [Jacek Laskowski](https://pl.linkedin.com/in/jaceklaskowski), an IT freelancer specializing in [Apache Spark](https://spark.apache.org/), [Delta Lake](https://delta.io/) and [Apache Kafka](https://kafka.apache.org/) (incl. [Kafka Streams](https://kafka.apache.org/documentation/streams/) and [ksqlDB](https://ksqldb.io/)) (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).
 
 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

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 markdown_extensions:
   - admonition
-  - codehilite
   - footnotes
+  - md_in_html
   - toc:
       permalink: true
   - pymdownx.arithmatex