feat(glossary): provide basic term glossary (#869)

* feat(glossary): provide basic term glossary

Enabled a site-wide terminology glossary.

* Added the `term` shortcode displaying term definition.
* Added the /glossary page showing all term definitions.
* Enabled a simplistic search of term definitions.

* refactor(glossary): update glossary page links and add callout for Hugo support

- Removed the glossary entry from the menu and adjusted weights for subsequent items.
- Added informational callouts in the glossary documentation for multiple languages, directing users to the Hugo Glossary Quick Reference.
- Updated links in the glossary documentation to point to the correct pages.

* fix(glossary): update links to glossary page format across multiple languages

- Changed links in the glossary documentation to use Hugo's relref format for consistency.
- Updated links in Persian, Japanese, English, and Simplified Chinese glossary pages.

---------

Co-authored-by: Xin <5097752+imfing@users.noreply.github.com>
Co-authored-by: Xin <xin@imfing.com>

assets/json/search-data.json

@@ -18,4 +18,20 @@
   {{- $output = $output | merge (dict $pageLink (dict "title" $pageTitle "data" $data)) -}}
 {{- end -}}
 
+{{/* Extract glossary data entries */}}
+{{- $glossaryEntries := dict -}}
+{{- with (index .Site.Data .Site.Language.Lang "termbase") -}}
+  {{- range . -}}
+    {{- $entry := cond (.abbr) (printf "%s %s %s" .abbr .term .definition) (printf "%s %s" .term .definition) -}}
+    {{- $glossaryEntries = $glossaryEntries | merge (dict .term $entry) -}}
+  {{- end -}}
+{{- end -}}
+
+{{- $glossary := dict
+  "title" "Glossary"
+  "data" $glossaryEntries
+-}}
+
+{{- $output = $output | merge (dict (relLangURL "glossary") $glossary )}}
+
 {{- $output | jsonify -}}