use absolutes

.github/ISSUE_TEMPLATE.md

@@ -1,4 +1,4 @@
-##### Please read the [CONTRIBUTING](https://github.com/ghostery/ghostery-extension/blob/master/CONTRIBUTING.md) guide before submitting an issue.
+##### Please read the [CONTRIBUTING](/CONTRIBUTING.md) guide before submitting an issue.
 
 ### Description
 

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
-* [ ] Have you followed the guidelines in [CONTRIBUTING.md](https://github.com/ghostery/ghostery-extension/blob/master/CONTRIBUTING.md)?
+* [ ] Have you followed the guidelines in [CONTRIBUTING.md](/CONTRIBUTING.md)?
 * [ ] Have you checked to ensure there aren't other open [Pull Requests](../pulls) for the same update/change?
 * [ ] Have you added an explanation of what your changes do?
 * [ ] Does your submission pass tests?