Add missed yarn.lock

Author: Benedikt Artelt

yarn.lock

@@ -2629,6 +2629,7 @@ __metadata:
     sass: "npm:^1.81.0"
     sass-loader: "npm:^16.0.3"
     shakapacker: "npm:8.0.2"
+    showdown: "npm:^2.1.0"
     sortablejs: "npm:^1.15.4"
     sorttable: "npm:^1.0.2"
     style-loader: "npm:^4.0.0"
@@ -2700,6 +2701,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"commander@npm:^9.0.0":
+  version: 9.5.0
+  resolution: "commander@npm:9.5.0"
+  checksum: 10c0/5f7784fbda2aaec39e89eb46f06a999e00224b3763dc65976e05929ec486e174fe9aac2655f03ba6a5e83875bd173be5283dc19309b7c65954701c02025b3c1d
+  languageName: node
+  linkType: hard
+
 "common-path-prefix@npm:^3.0.0":
   version: 3.0.0
   resolution: "common-path-prefix@npm:3.0.0"
@@ -6428,6 +6436,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"showdown@npm:^2.1.0":
+  version: 2.1.0
+  resolution: "showdown@npm:2.1.0"
+  dependencies:
+    commander: "npm:^9.0.0"
+  bin:
+    showdown: bin/showdown.js
+  checksum: 10c0/8508e060874c42338b9ebfe884763e8042d9575185d9dd3a12f7380736732893a4738f37140add97bde0c4c87d6bad66ed0761505f310df6044ee3385e2ae349
+  languageName: node
+  linkType: hard
+
 "side-channel@npm:^1.0.6":
   version: 1.0.6
   resolution: "side-channel@npm:1.0.6"