Visually outline that guideline message should be removed from
description before submitting the PR. This should prevent cases when PR
template was blending into the PRs description remaining unnoticed.
After switching squash merges to use the PR title and description, the
PR template text started leaking into final commit messages and adding
noise.
This PR removes the template and documents what a PR title and PR
description should contain instead.
See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10789
### Describe Your Changes
Please provide a brief description of the changes you made. Be as
specific as possible to help others understand the purpose and impact of
your modifications.
### Checklist
The following checks are **mandatory**:
- [ ] My change adheres to [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/victoriametrics/contributing/).
---------
Signed-off-by: hagen1778 <roman@victoriametrics.com>
Co-authored-by: Max Kotliar <kotlyar.maksim@gmail.com>
