Update contributing documentation (#1016)

CONTRIBUTING.md

@@ -2,8 +2,8 @@ Please use the issue templates when submitting a bug or improvement.
 
 This helps us fix the issue more easily.
 
-[Bug](https://github.com/pokeclicker/pokeclicker/blob/master/issue_bug_template.md)
+[Bug](https://github.com/pokeclicker/pokeclicker/issues/new?assignees=&labels=bug&template=bug_report.md&title=%5BBUG%5D+)
 
-[Improvement](https://github.com/pokeclicker/pokeclicker/blob/master/issue_improvement_template.md)
+[Suggestion](https://github.com/pokeclicker/pokeclicker/issues/new?assignees=&template=suggestion.md&title=%5BSUGGESTION%5D+)
 
 When submitting an idea or a new feature, feel free to express your thoughts however you like, no need to follow a template :)