Refactor language and metadata files to unify plugin name and description structure

languages/en.json

@@ -1,4 +1,6 @@
 {
-	"plugin-name": "Table of Contents",
-	"plugin-description": "Sticky ToC sidebar (desktop) and floating drawer (mobile) generated from the article's h2/h3/h4 headings."
+	"plugin-data": {
+		"name": "Table of Contents",
+		"description": "Sticky ToC sidebar (desktop) and floating drawer (mobile) built from the article's h2/h3/h4 headings."
+	}
 }

metadata.json

@@ -1,10 +1,11 @@
 {
+	"name": "Table of Contents",
+	"description": "Sticky ToC sidebar (desktop) and floating drawer (mobile) built from the article's h2/h3/h4 headings.",
 	"author": "spleenftw",
 	"email": "",
 	"website": "https://github.com/spleenftw/bludit-toc",
 	"version": "1.0.0",
 	"releaseDate": "2026-06-04",
 	"license": "MIT",
-	"compatible": "3.22.0",
-	"notes": "Sticky Table of Contents sidebar (desktop) and floating drawer (mobile) built from the article's h2/h3/h4 headings."
+	"compatible": "3.22.0"
 }