CI nightlies cpu/gpu & cleanup (#75)

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,29 @@
 # What does this PR do?
 
-Example: Fixes # (issue)
+Examples:
+- Fixes # (issue)
+- Adds new dataset
+- Optimizes something
 
+## How was it tested?
+
+Examples:
+- Added `test_something` in `tests/test_stuff.py`.
+- Added `new_feature` and checked that training converges with policy X on dataset/environment Y.
+- Optimized `some_function`, it now runs X times faster than previously.
+
+## How to checkout & try? (for the reviewer)
+
+Examples:
+```bash
+DATA_DIR=tests/data pytest -sx tests/test_stuff.py::test_something
+```
+```bash
+python lerobot/scripts/train.py --some.option=true
+```
 
 ## Before submitting
-- Read the [contributor guideline](https://github.com/huggingface/lerobot/blob/main/CONTRIBUTING.md#submitting-a-pull-request-pr).
-- Provide a minimal code example for the reviewer to checkout & try.
-- Explain how you tested your changes.
+Please read the [contributor guideline](https://github.com/huggingface/lerobot/blob/main/CONTRIBUTING.md#submitting-a-pull-request-pr).
 
 
 ## Who can review?