finished implementation of migration from legacy item db to stock db

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/stock/ItemProps.svelte

@@ -69,6 +69,9 @@
 {#if item}
 <LineEditor type="h3" editable={true} value={item.name} onSet={v => patch('name',v)} />
 Code: <LineEditor type="span" editable={true} value={item.code} onSet={v => patch('code',v)} />
+<div>
+    {@html item.description.rendered}
+</div>
 <table>
     <tbody>
         {#each item.properties.toSorted(byName) as prop}