refactor: instead of instructing to install dep, install it with smui-theme

Author: hperrin

SVELTEKIT.md

@@ -10,7 +10,6 @@ npm install --save-dev @smui/card
 # etc...
 
 npm install --save-dev smui-theme
-npm install --save-dev @material/theme
 ```
 
 Create your theme files with `smui-theme`.

packages/smui-theme/package.json

@@ -72,6 +72,7 @@
     "@smui/touch-target": "^6.0.0-beta.16"
   },
   "dependencies": {
+    "@material/theme": "^13.0.0",
     "node-fetch": "^2.6.7",
     "sass": "^1.50.0",
     "yargs": "^17.4.1"