fix: convert cf-kv and excalidraw-libraries from submodules to regular files

- Remove stale cloudflare-worker submodule entry from .gitmodules
- Remove .git dirs from cf-kv and excalidraw-libraries so Git tracks them as regular files
- Fixes 'No url found for submodule path cf-kv' CI error

excalidraw-libraries/scripts/gen-item-names.mjs

@@ -0,0 +1,23 @@
+import { readFile, writeFile } from "fs/promises";
+
+const PATH_LIBRARIES = "./libraries.json";
+
+const libraries = JSON.parse(await readFile(PATH_LIBRARIES, "utf8"));
+
+for (const lib of libraries) {
+  if (lib.version === 1) {
+    continue;
+  }
+
+  const libraryData = JSON.parse(
+    await readFile(`libraries/` + lib.source, "utf8"),
+  );
+  lib.itemNames = libraryData.libraryItems.reduce((acc, item) => {
+    if (item.name) {
+      acc.push(item.name);
+    }
+    return acc;
+  }, []);
+}
+
+await writeFile(PATH_LIBRARIES, JSON.stringify(libraries, null, 2));