Use jsonify to generate valid JSON

[ZakKemble]

Description

Invalid JSON is generated when a post contains tab characters since the remove_chars filter plugin is missing ( https://github.com/christian-fei/Simple-Jekyll-Search/tree/master/example/_plugins ). Use jsonify instead.

Relates to #475

Even if the text editor has been configured to use spaces instead of tabs, Rouge syntax highlighter will generate tabs in its tables.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How has this been tested

• I have run bash ./tools/deploy.sh --dry-run (at the root of the project) locally and passed
• I have tested this feature in the browser

Test Configuration

• Browser type & version: Firefox 97.0.1
• Operating system: Windows 10
• Ruby version: 2.7.4p191
• Bundler version: 2.3.8
• Jekyll version: 4.2.1

Checklist

• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[cotes2020]

many thanks!