Project restructuring.

Signed-off-by: Cliff Hill <xlorep@darkhelm.org>

.github/docs/adrs/000-template.md

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+# ADR N: brief decision title
+
+Describe here the forces that influence the design decision, including technological, cost-related, and project local.
+
+## Decision
+
+Describe here our response to these forces, that is, the design decision that was made. State the decision in full sentences, with active voice ("We will...").
+
+## Rationale
+
+Describe here the rationale for the design decision. Also indicate the rationale for significant _rejected_ alternatives. This section may also indicate assumptions, constraints, requirements, and results of evaluations and experiments.
+
+## Status
+
+[Proposed | Accepted | Deprecated | Superseded]
+If deprecated, indicate why. If superseded, include a link to the new ADR.
+
+## Consequences
+
+Describe here the resulting context, after applying the decision. All consequences should be listed, not just the "positive" ones.

.github/docs/diagrams/updater.mermaid

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+flowchart TD
+    A[Start] --> B[[Update start timestamp & get last updated]]
+    B --> C([Get track from plex])
+    C --> |more tracks| D[[Remove recently played tracks from playlist]]
+    D --> E[[Insert/update track into database]]
+    E --> C
+    C --> |no more tracks| F[[Clean up genres]]
+    F --> G[[Calculate statistics]]
+    G --> H[[Update end timestamp]]
+    H --> I[End]