chore: prepare release v3.21

[lowlighter]

📦 New features

• ♐ Code snippet of the day code
  • Add plugin_code_days option to restrict maximum age of displayed snippets feat(plugins/code): improvements #891
• 🦑 Miscelleanous
  • Use linguist-js fileContent for single files
  • Add support for ignoring users by email for commits related elements

🧰 Fixes and documentation

• docs(plugins/activity): fix ref/create and ref/delete display (Patch ref/create and ref/delete display #872 @RisingSunLight42)
• docs(plugins/core): improve config_order description
• docs(contributing): fix CONTRIBUTING.md grammar and link (fix: CONTRIBUTING.md grammar & link #878 @DalpatRathore)
• fix(app/metrics): make embed() defaults to repository when q.repo is specified
• fix(plugins/code): incorrect diff when lines starts with + or -
• fix(app/metrics): improvements for linguist-js related code (@Nixinova)
• docs: update images to support both light and dark mode, along with GitHub new UI
• fix(plugins/music): fixed overlapping music titles (fix(music): fixes #866 issue (Overlapping music title) #899 @RSickenberg)
• fix(app/web): misplaced tabs menu (fix(app/web): misplaced tabs menu issue #901 #903 @DalpatRathore)
• docs: grammatical errors (Fix grammatical errors #910 @PeterNjeim)
• fix(app/metrics): possible race condition in settings.json loading fix(app/metrics): possible race condition in settings.json loading #909

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