chore: simplify template

Author: failingtwice

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,30 +1,13 @@
-Provide a summary of the changes: context, problem, relevant issue, and solution.
-
-<!---
-uncomment for larger PRs that require more context and explanation
+A short summary of the changes.
 
 ## Context
+
 What the reviewer needs to know
 
 ## Problem
+
 What problem this PR solves, link relevant issue if it exists
 
 ## Solution
-Your proposed solution
--->
-
-## Changes:
-
-- [ ] Contracts
-  - [ ] Includes a **BREAKING CHANGE**!
-- [ ] Tests, scripts, tooling    
-- [ ] Dependencies
-- [ ] CI
-- [ ] Documentation
-- [ ] Meta
-
----
-
-- [ ] I agree to follow [Lido Code of Conduct](https://github.com/lidofinance/core/blob/master/CODE_OF_CONDUCT.md)
-- [ ] I have read [Lido Contribution Guide](https://github.com/lidofinance/core/blob/master/CONTRIBUTING.md)
 
+Your proposed solution