Revert "feat(registry): the video-primitive moves, documented and customisable (#3090)" (#3162)

This reverts commit 3b53bfd2f7.

registry/blocks/lower-third-bild/registry-item.json

@@ -2,7 +2,7 @@
   "$schema": "https://hyperframes.heygen.com/schema/registry-item.json",
   "name": "lower-third-bild",
   "type": "hyperframes:block",
-  "title": "Lower Third \u2014 BILD Style",
+  "title": "Lower Third — BILD Style",
   "description": "News-style lower third with tight-fit text boxes: white headline bar with red drop-shadow, red sub-line with white drop-shadow.",
   "dimensions": {
     "width": 1920,
@@ -10,18 +10,6 @@
   },
   "duration": 8,
   "tags": ["broadcast", "lower-third", "news", "overlay"],
-  "variables": [
-    {
-      "id": "TXT_MAIN_1_Line",
-      "type": "string",
-      "default": "BILD EXKLUSIV"
-    },
-    {
-      "id": "TXT_SUB",
-      "type": "string",
-      "default": "Sonderbericht"
-    }
-  ],
   "files": [
     {
       "path": "lower-third-bild.html",