fix: typo in README: stater -> starter

closes #764

Author: CaiJimmy

README.md

@@ -12,7 +12,7 @@ Use this template: [CaiJimmy/hugo-theme-stack-starter](https://github.com/CaiJim
 
 ## Demo
 
-* Stater template demo: [demo.stack.jimmycai.com](https://demo.stack.jimmycai.com)
+* Starter template demo: [demo.stack.jimmycai.com](https://demo.stack.jimmycai.com)
 * Dev build: [dev.stack.jimmycai.com](https://dev.stack.jimmycai.com)
 
 ## Documentation