refactor: ♻️ simplify pull request template in the template (#82)

# Description

Simplifies it plus add "format Markdown" checklist.

This PR needs a quick review.

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Co-authored-by: Signe Kirk Brødbæk <40836345+signekb@users.noreply.github.com>

Author: lwjohnst86

template/.github/pull_request_template.md

@@ -1,12 +1,11 @@
 # Description
 
-This PR will [DESCRIBE CHANGES].
 
 Closes #
 
 This PR needs a quick/an in-depth review.
 
 ## Checklist
 
-- [ ] Checked that the README is up to date
+- [ ] Format Markdown
 - [ ] Run `just run-all`