Setup improvements

[vemv]

• Improve clj-kondo setup
  • Prefer the official lein-clj-kondo plugin
  • Use and cache the clj-kondo analysis
• Makefile: cache spec2 directory
• Add a repl helper with enrich-classpath
  • Follows https://github.com/clojure-emacs/enrich-classpath#any-lein-or-toolsdeps-project
  • Paricularly needed for Orchard development.

Cheers - V

[vemv]

Note that the repl won't be functional unless you remove "does-not-exist.jar" from project.clj.

That's getting fixed in https://github.com/clojure-emacs/cider-nrepl/pull/811

[vemv]

All done, thanks for the eyeing!