NEW Pages module, few fix

(origin/pages)

NEW: Module Pages (slug router + backend)

  - migration (db)
  - routes
  - modules backend:
    - create/update operation
    - views ( list/create/edit )

ADD: (custom mainpage) 'site design'
CNG: add old bootstrap lib (for main page)
CNG: main config.yml (cng db password)

(in origin/master):

FIX: /app/modules/Core/Db/Manager.php method save
     ( doesnt use ID to create WHERE in update method )
CNG: form_div_layout.html.twig - textarea - add default css class
FIX: Some typos in SettingsForm.php
FIX: AdminController (module Settings and index.twig) - doesnt show notification
     (in form, JetFlashBag)
 Add comments (to Pages mod)