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

lisp/init-nov.el

@@ -2,10 +2,9 @@
 
 ;; `nov' package need enable libxml2 for Emacs
 
-(add-pkg-in-pkg-dir "nov")
-(add-pkg-in-pkg-dir "esxml")
-(add-pkg-in-pkg-dir "emacs-kv")
-(add-pkg-in-pkg-dir "emacs-db")
+(require 'init-package)
+
+(creature/pkg-active 'nov)
 
 (autoload 'nov-mode "nov" "" t)
 (add-to-list 'auto-mode-alist '("\\.epub\\'" . nov-mode))