Update workflows.md

.gitlab/issue_templates/workflows.md

-Structure
-=========
+Description
+===========
 
+> Add an overview of what the task is here.
 
-Data
-----
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+Key Actions
+-----------
+
+> Include relevant software actions (eg. import stl, apply function etc)
+
+Necessary Data
+--------------
+
+> (eg. stl files)
+
+Additional Notes
+----------------
+
+> Additional details relevant to the workflow (eg. potential errors)
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