Finish adding editing support to the Image app

templates/ImageApp/header.hbs

@@ -1,14 +1,29 @@
 <header>
 	<div class="row">
 		<label for="{{meta.idp}}-image">
-			Image File
+			Image
 		</label>
-		{{!-- TODO: when adding support for editing, make this readonly --}}
-		<input
-			type="file"
-			id="{{meta.idp}}-image"
-			accept="{{imageTypes}}"
-			name="file"
-		>
+		{{#if docID}}
+			<input
+				type="text"
+				id="{{meta.idp}}-image"
+				value="{{imageURL}}"
+				disabled
+				readonly
+			>
+			<button
+				type="button"
+				data-action="removeEditingImage"
+			>
+				Clear
+			</button>
+		{{else}}
+			<input
+				type="file"
+				id="{{meta.idp}}-image"
+				accept="{{imageTypes}}"
+				name="file"
+			>
+		{{/if}}
 	</div>
 </header>