fix(misc): add missing alt text to files-readme logo (#14446)

Author: JoshuaKGoldberg

packages/workspace/src/generators/new/files-readme/README.md.template

@@ -1,6 +1,6 @@
 # <%= formattedNames.className %>
 
-<a href="https://nx.dev" target="_blank" rel="noreferrer"><img src="https://raw.githubusercontent.com/nrwl/nx/master/images/nx-logo.png" width="45"></a>
+<a alt="Nx logo" href="https://nx.dev" target="_blank" rel="noreferrer"><img src="https://raw.githubusercontent.com/nrwl/nx/master/images/nx-logo.png" width="45"></a>
 
 ✨ **This workspace has been generated by [Nx, a Smart, fast and extensible build system.](https://nx.dev)** ✨<% if (!!appName) { %>