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>

docs/data/fa/termbase.yaml

@@ -0,0 +1,12 @@
+---
+# واژه‌نامه اصطلاحات
+#
+# نمونه‌ای از استفاده از term.html:
+#
+# {{< term "SEO" >}}
+
+- term: seo
+  abbr: SEO
+  definition: "بهینه‌سازی موتور جستجو – افزایش دیده‌شدن یک صفحهٔ وب در نتایج موتورهای جستجو"
+- term: "سازندهٔ سایت ایستا"
+  definition: "موتورهایی که ورودی متنی را پردازش کرده و صفحات وب ایستا تولید می‌کنند"