🧹 Refactor duplicated tag rendering code into a partial

[k4rtik]

🎯 What: The code health issue addressed

Extracted duplicated HTML code for rendering tag list items in layouts/tags/terms.html into a new reusable partial layouts/partials/tag_li.html.

💡 Why: How this improves maintainability

Adheres to DRY (Don't Repeat Yourself) principles, making future updates to tag rendering easier as changes only need to be made in one place.

✅ Verification: How you confirmed the change is safe

• Verified the content of the new partial layouts/partials/tag_li.html using read_file.
• Verified the refactored layouts/tags/terms.html to ensure the partial is correctly called with the appropriate context.
• Received a positive code review confirming the refactoring is safe and follows Hugo conventions.
• (Note: hugo was not available in the environment to run build.sh).

✨ Result: The improvement achieved

Reduced code duplication in the tag listing template and improved overall maintainability.

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PR created automatically by Jules for task 497608382929766942 started by @k4rtik

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