fix link to /issues to use internal/relative links within GH repo

Author: russHyde

CONTRIBUTING.md

@@ -5,7 +5,6 @@
 For a new project, search-and-replace
 - CURRENT_PROJECT
 - COFC_URL (The URL for the code-of-conduct for the current project)
-- ISSUES_URL (The URL for the Issues board for the current project)
 -->
 
 First off, thanks for taking the time to contribute! ❤️
@@ -55,15 +54,15 @@ unacceptable behavior to <MAINTAINER>.
 > documentation.
 
 Before you ask a question, it is best to search for existing
-[Issues](ISSUES_URL) that might help you. In
+[Issues](/issues) that might help you. In
 case you have found a suitable issue and still need clarification, you can write
 your question in this issue. It is also advisable to search the internet for
 answers first.
 
 If you then still feel the need to ask a question and need clarification, we
 recommend the following:
 
-- Open an [Issue](ISSUES_URL/new).
+- Open an [Issue](/issues/new).
 - Provide as much context as you can about what you're running into.
 - Provide project and platform versions (nodejs, npm, etc), depending on what
   seems relevant.
@@ -111,7 +110,7 @@ steps in advance to help us fix any potential bug as fast as possible.
 - To see if other users have experienced (and potentially already solved) the
   same issue you are having, check if there is not already a bug report existing
   for your bug or error in the
-  [bug tracker](ISSUES_URL?q=label%3Abug).
+  [bug tracker](/issues?q=label%3Abug).
 
 <!-- omit in toc -->
 #### How Do I Submit a Good Bug Report?
@@ -125,7 +124,7 @@ be sent encrypted as well. -->
 We use GitHub issues to track bugs and errors. If you run into an issue with the
 project:
 
-- Open an [Issue](ISSUES_URL/new). (Since we
+- Open an [Issue](/issues/new). (Since we
   can't be sure at this point whether it is a bug or not, we ask you not to talk
   about a bug yet and not to label the issue.)
 - Explain the behavior you would expect and the actual behavior.
@@ -152,7 +151,7 @@ the community to understand your suggestion and find related suggestions.
 - Make sure that you are using the latest version.
 - Read the documentation carefully and find out if the functionality is already
   covered, maybe by an individual configuration.
-- Perform a [search](ISSUES_URL) to see if the
+- Perform a [search](/issues) to see if the
   enhancement has already been suggested. If it has, add a comment to the
   existing issue instead of opening a new one.
 - Find out whether your idea fits with the scope and aims of the project. It's
@@ -164,7 +163,7 @@ the community to understand your suggestion and find related suggestions.
 #### How Do I Submit a Good Enhancement Suggestion?
 
 Enhancement suggestions are tracked as
-[GitHub issues](ISSUES_URL).
+[GitHub issues](/issues).
 
 - Use a **clear and descriptive title** for the issue to identify the
   suggestion.