dev: Fix 404 message for missing favicon.ico

* Make a symlink *(soft)* to favicon.ico for dev to remove the error of not finding the ico. Affects only dev and `/images` path should be used for code refs and edits... ignore any "no newline at end of file" messages or it will break
* Now it will show in dev under Nix... Win7+ or greater is probably required for this to show as found since it handles file symbolic links... XP *(EOLd)* and before only do dirs.