🐛 Bug: "python 3" filter should be removed

Describe the bug

The "Python 3" language filter is useless and confusing:

• Python 2 was EOL'd with the end of support for Python 2.7 on January 1st, 2020 (https://www.python.org/doc/sunset-python-2/)
• only one package is listed under python 3 (jsonschema-models), which seems to have been more out of confusion than any logic
• per (1), every package listed under "python" should run on python 3 unless they have been unmaintained for a very very long time

Steps To Reproduce

1. go to https://json-schema.org/tools
2. fitler on "language: Python 3" and "tooling type: Validator"
3. apply filter
4. see nothing
5. realise you should have selected "python" because that's where most of the libraries live

Expected Behavior

Not having a confusing option for python.

Are you working on this issue?

No

Do you think this work might require an [Architectural Decision Record (ADR)]? (significant or noteworthy)

No

Start at the tools page and trace the configuration that supplies its language filters. Remove the “Python 3” option while retaining “Python,” then verify the reproduction steps no longer show the confusing choice and that Python tools remain discoverable.