make it easier to figure out how to debug issues (#14477)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -12,9 +12,14 @@ Function `echo` outputs the wrong string.
 ### Example
 ```nim
 echo "Hello World!"
+# This code should be a minimum reproducible example:
+# try to simplify and minimize as much as possible. If it's a compiler
+# issue, try to minimize further by removing any imports if possible.
 ```
 
 ### Current Output
+please check whether the problem still exists in git head before posting,
+see [rebuilding the compiler](https://nim-lang.github.io/Nim/intern.html#rebuilding-the-compiler).
 ```
 Hola mundo!
 ```
@@ -29,12 +34,18 @@ Hello World!
 * In file xyz there is a call that might be the cause of it.
 
 ### Additional Information
+If it's a regression, you can help us by identifying which version introduced
+the bug, see [Bisecting for regressions](https://nim-lang.github.io/Nim/intern.html#bisecting-for-regressions),
+or at least try known past releases (eg `choosenim 1.2.0`).
+
+If it's a pre-existing compiler bug, see [Debugging the compiler](https://nim-lang.github.io/Nim/intern.html#debugging-the-compiler)
+which should give more context on a compiler crash.
 
-* It was working in version a.b.c
 * Issue #abc is related, but different because of ...
 * This issue is blocking my project xyz
 
 ```
 $ nim -v
 Nim Compiler Version 0.1.2
+# make sure to include the git hash if not using a tagged release
 ```