chore: organize into folders

frontmatter/abstract.tex

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+This document records the development-environment configuration for the first
+SSW 590 assignment. It describes the Kanban board used to plan and track the
+work, the hosts the environment will comprise, and the password rules that 
+will govern accounts on those hosts. The environment is specified here as a
+plan; provisioning and its supporting evidence are deferred to a later
+submission. Password rules are recorded as derivation hints, so that no
+credential appears in this document.