The actual PR template feels more like bureaucracy than an actual guide
or checklist to help the PR author explain all important thigs that any
reviewer or changelog reader may need to understand.
We'll be moving most of the redundant things (like remembering tests are
needed, or explaning how things where implemented with a clear and
granular commit history) into a Wiki/Doc entry.
For regular contributors there is no need for reminders, we need to
improve new contributors landing with good guides and lowering the bar
for first PR's
Why:
* The template tried to specify a placeholder for the title, but instead it was used as first line in the description
* The template tried to specify a guide for each section with a `>` character to imply it was a comment, but people didn't remove it
How:
* Removing the first line specifying the title placeholder that has no use
* Changing the `>` character on each section guide for a `-` that can be easily reused for enumerations
