Add rehype-jargon to list of plugins

[LunaticMuch]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

Added rehype-jargon to the list plugins. Used to be a remark plugin but it's not a rehype plugin. The other version is no more available.

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (1df8459) compared to base (842d6ab).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #107   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          454       454           
=========================================
  Hits           454       454           

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[wooorm]

Thank you! :)