switch to ember-cli-shiki

Author: mansona

Diff for: config/fastboot.js

@@ -0,0 +1,9 @@
+module.exports = function () {
+  return {
+    buildSandboxGlobals(defaultGlobals) {
+      return Object.assign({}, defaultGlobals, {
+        atob: atob,
+      });
+    },
+  };
+};

Diff for: package.json

@@ -83,7 +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-showdown": "^9.0.1",
     "ember-cli-terser": "^4.0.2",
     "ember-composable-helpers": "^3.1.1",
     "ember-concurrency": "^2.3.7",
@@ -101,7 +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-showdown-shiki": "^1.2.1",
     "ember-sinon": "^4.1.1",
     "ember-source": "~3.28.8",
     "ember-styleguide": "^3.3.0",