Convert backend/web from submodule to regular directory

backend/web/.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+	"recommendations": [
+		"svelte.svelte-vscode",
+		"esbenp.prettier-vscode",
+		"dbaeumer.vscode-eslint",
+		"bradlc.vscode-tailwindcss"
+	]
+}