WIP sopn process diagram

ynr/apps/sopn_parsing/sopn_processing.mermaid

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+```mermaid
+	graph TD
+	---
+	title: sopn processing
+	---
+
+	flowchart LR
+	id
+	subgraph Input
+		A[Input Documents (PDFs, Non-PDFs)]
+	end
+
+	subgraph Preprocessing
+		B[Document Preprocessing]
+		B --> C[Document Conversion]
+		B --> D[Page Matching]
+		B --> E[Page Extraction]
+	end
+
+	subgraph Parsing
+		F[Text Parsing]
+		G[Metadata Extraction]
+		H[Content Analysis]
+		I --> J
+		K --> L
+	end
+
+	subgraph Output
+		H[Structured Data]
+	end
+
+	A --> B
+	C --> E
+	D --> E
+	E --> H
+	F --> H
+	G --> H
+```