Change Issue Tracker from GitHub to Monorail

I've set up a Monorail instance at https://bugs.avm99963.com/ which I
will use for issue tracking purposes in all my personal projects.

This change changes the documentation to point to the new issue tracker
and adds a redirection from the GitHub "New Issue" page to the "New
Issue" page in Monorail.

Change-Id: I1e35e92943476b0f6880c7d3b803e7a0ce141da9
diff --git a/README.md b/README.md
index 6373612..d1cad0f 100644
--- a/README.md
+++ b/README.md
@@ -11,10 +11,11 @@
 This extension is being actively developed, and everyone is welcome to make
 feature requests, report issues and contribute code changes.
 
-In order to make feature requests or report issues, please do so at the GitHub
-issue tracker:
+In order to make feature requests or report issues, please do so at the Monorail
+Issue Tracker:
 
-- [Issues · avm99963/infinitegforums · GitHub](https://github.com/avm99963/infinitegforums/issues)
+- [Submit a new issue](https://bugs.avm99963.com/p/twpowertools/issues/entry)
+- [List of open issues](https://bugs.avm99963.com/p/twpowertools/issues/list)
 
 To see a more exhaustive guide on how to contribute, and information on how to
 contribute code changes, please read the following doc: <!--It also includes