chore: Add jsonschema-markdown project to Documentation section.

[elisiariocouto]

What kind of change does this PR introduce?
Adds jsonschema-markdown to the list of tools used for documentation.

Issue Number:
N/A

Screenshots/videos:
N/A

If relevant, did you update the documentation?
Yes

Summary
Adds jsonschema-markdown to the list of tools used for documentation.

Does this PR introduce a breaking change?
No

[github-actions]

Hey there 👋!

Are you an implementer of a new JSON Schema related tool, or an interested user submitting a tool you like?
If so, thanks for considering adding your tool to our collection -- and if not, sorry, I'm just a bot looking at which pages you're modifying!

Someone will review your pull request shortly.

In the interim, if you haven't already, there's a few things you might be interested in reviewing or confirming:

1. Short description: Tell us a small bit about your tool! We love staying up to date on what's out there, and what your intentions are in writing it.
2. Come Join Our Slack!: We have an #implementers channel for anyone interested in or building JSON Schema tooling!
   An invite can be found here or on our homepage!
3. Common Interfaces: We maintain a page with some "commonly useful programming interfaces" that tooling may want to implement and present to your users.
   You can find that page here in our documentation.
   Have a read through and consider whether you implement or should implement any of what's there.
4. Bowtie Harness: Bowtie is a tool which gives JSON Schema users access to a huge number of different implementations across many languages, and reports on the compliance of those implementations with the JSON Schema specifications.
   If it makes sense for your kind of tool, consider writing a harness which connects it to Bowtie. Instructions for doing so can be found in the tutorial in Bowtie's documentation.

If you have any questions, any feedback, or need help with the submission process, don't hesitate to reach out.
Thanks a bunch for your awesome contribution!

[github-actions]

Welcome to the JSON Schema Community. Thanks a lot for creating your first pull request!! 🎉🎉 We are so excited you are here! We hope this is only the first of many! For more details check out README.md file.

[github-actions]

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Name	Status	Preview	Last Commit
website	✅ Ready (View Log)	Visit Preview	7dc5905

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5a7f2ff) to head (7dc5905).

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines           20        20           
  Branches        12        12           
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  Hits            20        20           

☔ View full report in Codecov by Sentry.
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[benjagm]

Thanks a lot for creating your implementation and adding it to the website!! @elisiariocouto

[github-actions]

Congratulations, @elisiariocouto for your first pull request merge in this repository! 🎉🎉. Thanks for your contribution to JSON Schema!