refactor: Split note file

HepLean/Meta/Notes/NoteFile.lean

@@ -0,0 +1,38 @@
+/-
+Copyright (c) 2024 Joseph Tooby-Smith. All rights reserved.
+Released under Apache 2.0 license.
+Authors: Joseph Tooby-Smith
+-/
+import HepLean.Meta.Notes.Basic
+/-!
+
+# Note file
+
+A note file is a structure which contains the information to go into a note.
+
+-/
+
+namespace HepLean
+open Lean System Meta
+
+/-- A note consists of a title and a list of Lean files which make up the note. -/
+structure NoteFile where
+  /-- The overall title of the note. -/
+  title : String
+  /-- The abstract of the note. -/
+  abstract : String
+  /-- A list of authors. -/
+  authors : List String
+  /-- The files making up the note in the order in which they should appear. -/
+  files : List Name
+
+namespace NoteFile
+
+variable (N : NoteFile)
+
+/-- All imports associated to a note. -/
+def imports : Array Import := (N.files.map fun f => {module := f}).toArray
+
+end NoteFile
+
+end HepLean