Move commands to EINE

[jcs090218]

Anyone can extend Eask in whatever way they need.

EINE is one approach for doing this.

• eask cat -> https://github.com/emacs-eine/cat
• eask concat
• eask lint org -> https://github.com/emacs-eine/x-org-lint
• eask loc

, etc.

Footnotes:

• cat is still being used as an example at https://github.com/emacs-eask/cli/blob/master/docs/content/Getting-Started/Basic-Usage/_index.en.md?plain=1#L191