feat: Optional full-width toggle for document display (#2869)

* Migration, model, presenter

* Working implementation

* fix: Account for table of contents

* Checkbox -> Toggle

* Checkbox -> Toggle

server/models/Document.ts

@@ -81,6 +81,7 @@ const Document = sequelize.define(
     previousTitles: DataTypes.ARRAY(DataTypes.STRING),
     version: DataTypes.SMALLINT,
     template: DataTypes.BOOLEAN,
+    fullWidth: DataTypes.BOOLEAN,
     editorVersion: DataTypes.STRING,
     text: DataTypes.TEXT,
     state: DataTypes.BLOB,