Add markdown-it-image-figures for treating images as block elements

Signed-off-by: Jonas <jonas@freesources.org>

Author: mejo-

package-lock.json

@@ -89,6 +89,7 @@
     "markdown-it": "^13.0.1",
     "markdown-it-container": "^3.0.0",
     "markdown-it-front-matter": "^0.2.3",
+    "markdown-it-image-figures": "^2.1.0",
     "mitt": "^3.0.0",
     "path-normalize": "^6.0.7",
     "prosemirror-collab": "^1.3.0",