Add issue template and other fixes

Author: mosuem

.github/ISSUE_TEMPLATE/watcher.md

@@ -0,0 +1,5 @@
+---
+name: "package:watcher"
+about: "Create a bug or file a feature request against package:watcher."
+labels: "package:watcher"
+---

pkgs/watcher/pubspec.yaml

@@ -3,7 +3,7 @@ version: 1.1.1-wip
 description: >-
   A file system watcher. It monitors changes to contents of directories and
   sends notifications when files have been added, removed, or modified.
-repository: https://github.com/dart-lang/watcher
+repository: https://github.com/dart-lang/tools/tree/main/pkgs/watcher
 
 environment:
   sdk: ^3.1.0