.air/appview: exclude nix/

Even though nothing in this folder would match the extensions we watch,
probably makes sense to not even waste the cycles doing so.

Signed-off-by: Winter <[e-mail]>

.air/appview.toml

···
 
 exclude_regex = [".*_templ.go"]
 include_ext = ["go", "templ", "html", "css"]
-exclude_dir = ["target", "atrium"]
+exclude_dir = ["target", "atrium", "nix"]