docs: improved glossary feature (#4819)

www/docs/content/glossary.mdx

@@ -0,0 +1,11 @@
+---
+description: "Learn about the different terms related to Medusa"
+---
+
+import Glossary from "@site/src/components/Glossary"
+
+# Glossary
+
+Find definitions of different basic terms in the Medusa documentation.
+
+<Glossary />