chore(github): simplify PR template (#991)

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,8 +2,6 @@
 
 <!--
 Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
-
-e.g. Fixes #(issue)
 -->
 
 ## Type of change
@@ -13,9 +11,14 @@ Please select the desired item checkbox and change it to "[x]", then delete opti
 -->
 - [ ] Bug fix (non-breaking change which fixes an issue)
 - [ ] New feature (non-breaking change which adds functionality)
+- [ ] Improvement (refactoring and improving code)
 - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
 - [ ] Documentation update
 
+## Additional context
+
+<!-- e.g. Fixes #(issue) -->
+
 ## How has this been tested
 
 <!--
@@ -24,11 +27,3 @@ Please describe the tests that you ran to verify your changes. Provide instructi
 
 - [ ] I have run `bash ./tools/test` (at the root of the project) locally and passed
 - [ ] I have tested this feature in the browser
-
-### Test Configuration
-
-- Browser type & version:
-- Operating system:
-- Ruby version: <!-- by running: `ruby -v` -->
-- Bundler version: <!-- by running: `bundle -v`-->
-- Jekyll version: <!-- by running: `bundle list | grep " jekyll "` -->