Configure Lexxy to add extra spacing between block elements

Updating Lexxy to v0.8.0 for the insert-markdown event.

app/javascript/initializers/index.js

@@ -1,3 +1,4 @@
 import "initializers/current"
 import "initializers/bridge/bridge_element"
 import "initializers/offline"
+import "initializers/lexxy_markdown_paste"

app/javascript/initializers/lexxy_markdown_paste.js

@@ -0,0 +1,3 @@
+document.addEventListener("lexxy:insert-markdown", (event) => {
+  event.detail.addBlockSpacing()
+})