Get top 10 HN posts (#5604)

* updating DIRECTORY.md

* updating DIRECTORY.md

* Create get_top_hn_posts.py

* updating DIRECTORY.md

* Add return type and desc

* Add texttable

* Update web_programming/get_top_hn_posts.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Update web_programming/get_top_hn_posts.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Get top 10 posts

* Update get_top_hn_posts.py

* Don't use texttable

* Setup doctest

* Fix pre-commit issues

* Remove print statement

* Add hackernews_top_stories_as_markdown()

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>