use "creature/pkg-active" manage packages manually

- replace "add-pkg-in-pkg-dir" (recursive load-path scanning) with a
  central "creature/pkgs" registry that handles load path, autoloads,
  info dirs and dependencies
- adapt all init-*.el files to the new activation function
- add a top-level Makefile to byte-compile site-lisp packages
- remove unused "emacs-kv" and "emacs-db" submodules

example/websocket/websocket.el

@@ -1,7 +1,7 @@
 ;; -*- coding: utf-8; lexical-binding: t; -*-
 
 (require 'init-package)
-(add-pkg-in-pkg-dir "emacs-websocket")
+(add-to-list 'load-path (file-name-concat creature/pkg-dir "emacs-websocket"))
 
 (require 'websocket)