Allow PR Description to be fixed so its scrolls while going through the PR.

[philipbordallo]

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When creating a PR I usually scroll through my changes and create an overview in the PR Description to give reviewers more context about what my PR does and as a side effect also confirm to myself I know what I actually changed.

To make this a better experience, I usually edit the CSS on the page so that the PR Description container is position: fixed so it scrolls along with me and I don't have to keep scrolling to the top to add each change.

I know that AI probably can probably solve the task of creating an overview already but things like Copilot for PRs end up just creating a lot of noise that I'm assuming a lot of people have started to ignore. And maybe they ignore my descriptions as well but there is still some value in reviewing and validating your own PR before you ask others to.

It would be amazing if the PR Description container had a toggle-able setting that allowed it to be fixed and scroll with you as you review your changes.