Add CockroachDB University Course Links (#7888)

* Add Python 3 Book

Python 3 book from DigitalOcean.

* Update list to add learning Processing resource

Reattempted.

* Update podcasts-screencasts-en.md

Changed playlist and added the contributor name.

* Alphabetize Processing playlists

Alphabetize the processing playlists added.

* Removed Processing Resource

Removed Processing YouTube links from screencasts.

* Updated free-courses with Processing Resource

Added processing resource in free courses list.

* Update free-courses-en.md Readme

Added Deno course from freeCodeCamp.

* Update free-courses-en.md

Removed Deno resource from master branch.

* chore(deps): bump actions/upload-artifact from 2 to 3

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update free-courses-en.md - CockroachDB

Added a new distributed SQL course platform - CockroachDB University.

* Update free-courses-en.md

Removed trailing slash in CockroachDB website - linter error.

* Update free-course-en.md

Removed the generic CockroachDB website link and added two-course links from the website.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

courses/free-courses-en.md

@@ -382,8 +382,10 @@
 
 #### SQL
 
+* [Getting Started with SQL for Application Developers](https://university.cockroachlabs.com/courses/course-v1:crl+getting-started-with-sql-for-app-devs+self-paced/about) - Wade Waldron (Cockroach Labs Inc.) *(email address required)*
 * [Introduction to Database Queries](https://www.edx.org/course/introduction-to-database-queries) - Aspen Olmsted (edX New York University)
 * [Introduction to Databases and SQL Querying](https://www.udemy.com/course/introduction-to-databases-and-sql-querying/) - Rakesh Gopalakrishnan (Udemy)
+* [Introduction to Distributed SQL and CockroachDB](https://university.cockroachlabs.com/courses/course-v1:crl+intro-to-distributed-sql-and-cockroachdb+self-paced/about) - Lauren Hirata Singh and Will Cross (Cockroach Labs Inc.) *(email address required)*
 * [Learn SQL](https://popsql.com/learn-sql) - PopSQL
 * [MySQL Tutorial for Beginners [Full Course]](https://www.youtube.com/watch?v=7S_tz1z_5bA) - Moshfegh Hamedani (Programming with Mosh)
 * [SQL Foundations](https://www.udemy.com/course/sql-essentials-for-beginners/) - Sagar Uppuluri (Udemy)