install showdown and prism

Author: mansona

package.json

@@ -83,6 +83,7 @@
     "ember-cli-inject-live-reload": "^2.1.0",
     "ember-cli-meta-tags": "^7.0.0",
     "ember-cli-sass": "^10.0.1",
+    "ember-cli-showdown": "^8.0.0",
     "ember-cli-terser": "^4.0.2",
     "ember-composable-helpers": "^3.1.1",
     "ember-concurrency": "^2.3.7",
@@ -100,6 +101,7 @@
     "ember-resolver": "^8.0.3",
     "ember-rfc176-data": "^0.3.17",
     "ember-route-action-helper": "^2.0.5",
+    "ember-showdown-prism": "^4.4.0",
     "ember-sinon": "^4.1.1",
     "ember-source": "~3.28.8",
     "ember-styleguide": "^3.3.0",