Fix/tag routing

[PaarthPandey10]

Describe your changes

This PR resolves several issues identified during site building:

• Tag Routing: Fixed a casing mismatch in terms.html by normalizing tag IDs and CSS classes to lowercase. This ensures the filter logic correctly matches items with their assigned tags.
• HTML Rendering: Added | safeHTML to the summary rendering pipeline in terms.html to prevent embedded HTML tags (like <p>, <ul>, <li>) from being escaped and displayed as plain text.
• Build Stability: Updated deprecated .Site.DisqusShortname calls (which were causing build errors in newer Hugo versions) to the safe .Site.Params.DisqusShortname syntax across all project layouts and vendored theme partials. Added an if guard to the Disqus partial to prevent build failures when disqusShortname is empty.
• YAML Correction: Fixed a minor YAML parsing error in content/en/rule.md that was preventing successful site assembly.

Related issue number or link

resolves #66

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• This PR does not contain plagiarism
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[GeauxJD]

@PaarthPandey10 can you adjust this pull request (and also #103 ) so that this pull request only includes the changes that address the tag routing and 103 only includes the glossary terms and spellcheck edits?

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