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

Checklist before opening this PR (put x in the checkboxes)

• This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• I have signed off on all commits
  • signing off (ex: git commit -s) is to affirm that commits comply DCO. If you are working locally, you could add an alias to your gitconfig by running git config --global alias.ci "commit -s".