Remove knowledge base specific language from CONTRIBUTING.md

[elsevers]

Context

Related Issues / PRs:

• Update link to standard checklist within PR template #1
• https://github.com/Severson-Group/KnowledgeBase/pull/298

The CONTRIBUTING.md file is a revised version of a file originally found in the Knowledge Base. This file retains some of its KB-specific language:

.github/CONTRIBUTING.md

Lines 21 to 23 in 15c0f20

	## Purpose of Document
	This document explains the procedures, policies, and best-practices for contributing content to the knowledge base.

Approach

Close this issue via a PR that removes the KB-specific language.