Remove CLI functionality

[totakke]

I removed CLI functionality from cljam and added a notice message about Gnife to README.md.

This PR aims at separating the CLI functionality from cljam and making cljam a pure Clojure library. Gnife is a pure CLI and contains all cljam's commands in sequence and sam types. (See https://github.com/chrovis/gnife/blob/main/README.md#command-list)

I confirmed lein test :all passed. I will leave the merge timing of this PR up to you.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.64%. Comparing base (ec9c199) to head (ac0d716).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
+ Coverage   88.25%   88.64%   +0.39%     
==========================================
  Files          85       83       -2     
  Lines        7381     7143     -238     
  Branches      488      447      -41     
==========================================
- Hits         6514     6332     -182     
+ Misses        379      364      -15     
+ Partials      488      447      -41     

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