Remove unnecessary aws alias

Looks like this is no longer necessary: https://developer.1password.com/docs/cli/shell-plugins/aws/

i.e. this is now handled automatically by:

```sh
source "$HOME/.config/op/plugins.sh"
```

dotfiles/.aliases

@@ -26,10 +26,6 @@ alias cat="bat --paging=never"
 # bottom (top replacement)
 alias top="btm"
 
-# Overrides to use 1Password CLI to load env vars
-# https://developer.1password.com/docs/cli/authenticate-clis/
-alias aws="op run --env-file=\$HOME/.config/op/aws.env -- aws"
-
 # Reload the shell
 alias reload="source ~/.zshrc"