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.

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

docs/data/en/termbase.yaml

@@ -0,0 +1,12 @@
+---
+# Terminology glossary
+#
+# Example usage of term.html shortcode:
+#
+# {{< term "SEO" >}}
+
+- term: seo
+  abbr: SEO
+  definition: "Search engine optimization – improving the visibility of a web page in search engines"
+- term: static site generator
+  definition: "Software engines processing text input to generate static web pages"