make some sections collapsible in ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

@@ -1,5 +1,8 @@
-### What did you do? (required. The issue will be **closed** when not provided.)
+### What did you do? (required: The issue will be **closed** when not provided)
 
+<!--
+If possible, please provide clear steps for reproducing the problem.
+-->
 
 ### What did you expect to happen?
 
@@ -9,13 +12,18 @@
 
 ### Configuration (**MUST** fill this out):
 
-* vim-go version:
+#### vim-go version:
 
-* `vimrc` you used to reproduce (use a *minimal* vimrc with other plugins disabled; do not link to a 2,000 line vimrc):
+####  `vimrc` you used to reproduce (use a *minimal* vimrc with other plugins disabled; do not link to a 2,000 line vimrc):
+<details><summary>vimrc</summary><br><pre>
 
-* Vim version (first three lines from `:version`):
+</pre></details>
 
-* Go version (`go version`):
+#### Vim version (first three lines from `:version`):
 
-* Go environment (`go env`):
+####  Go version (`go version`):
 
+#### Go environment
+<details><summary><code>go env</code> Output:</summary><br><pre>
+
+</pre></details>