chore: update github issue template (#807)

Co-authored-by: Anton Medvedev <anton@medv.io>

Author: antongolub

.github/ISSUE_TEMPLATE.md

@@ -1,16 +1,21 @@
-## Expected Behavior
+### Expected Behavior
+```js
 
+```
 
-## Actual Behavior
+### Actual Behavior
+```js
 
+```
 
-## Steps to Reproduce the Problem
+### Steps to Reproduce
 
 1.
-1.
-1.
+2.
+3.
 
-## Specifications
+### Specifications
 
-- Version:
-- Platform:
+- zx version:  x.x.x
+- Platform: windows / macos / linux
+- Runtime: node / deno / bun

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,11 @@
-Fixes #<issue_number_goes_here>
+<!-- It's a good idea to open an issue first for discussion. -->
 
-> It's a good idea to open an issue first for discussion.
+Fixes #<number_goes_here>
+
+<!-- Usage demo -->
+```js
+
+```
 
 - [ ] Tests pass
 - [ ] Appropriate changes to README are included in PR
-- [ ] Types updated