Delete unused PR template

.github/PULL_REQUEST_TEMPLATE/atomic-refactor-pull-request-for-issue-2119.md

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-<!-- this template is for changes relating to #2119. You might want to use the standard template. -->
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-# Description
-
-<!-- do not remove -->
-This PR is for updating/adding a component following the atomic design pattern set out in #2119.
-
-<!-- mention the component you changed, and describe any design choices if necessary -->
-
----
-
-Extra Info
-
-<!-- fill these in -->
-- Component name in [kanban board](https://collab.owncast.tv/kanban/#/2/kanban/edit/omLI2N+LcnP+elmdT7qW9GHD/): `________`
-
-Checklist: 
-- [] The component follows the [design guide](../../web/components/_COMPONENT_HOW_TO.md).
-- [] Moved the component to the correct `atoms` / `molecules` / `organisms` / `templates` directory. 
-- [] Added an explanation to this PR for any major changes you made.
-- [] Replaced any [`defaultProps`](https://www.reactjstutorials.com/react-basics/17/react-default-props) with default args.
-- [] Added a (short) JSDoc description to the component.
-- [] Removed the component's Storybook description text with if it's not needed.