fix: stencil projects can build ionicons (#1462)

Author: sean-perkins

package.json

@@ -12,6 +12,8 @@
   "types": "dist/types/index.d.ts",
   "unpkg": "dist/ionicons/ionicons.esm.js",
   "jsdelivr": "dist/ionicons/ionicons.esm.js",
+  "collection": "dist/collection/collection-manifest.json",
+  "collection:main": "dist/collection/index.js",
   "exports": {
     ".": {
       "types": "./dist/types/index.d.ts",

stencil.config.ts

@@ -6,7 +6,7 @@ export const config: Config = {
   outputTargets: [
     {
       type: 'dist',
-      collectionDir: null,
+      collectionDir: './collection',
       empty: false,
     },
     {