page tree - deleting some other pages with very little content

docs/build.md

-# Building CiviCRM
-
-TODO:
-
--   Nightlies vs gitify vs civibuild
--   gitify
--   civibuild (https://github.com/civicrm/civicrm-buildkit/blob/master/doc/civibuild.md)

docs/customize.md

-# Customizing CiviCRM
-
-TODO:
-
--   *(Requirements: Don't need full git install)*
--   *(When possible, link to User/Admin Guide or other existing docs instead
-    of giving details.)*
--   Custom fields, profiles, option groups, etc
--   webform_civicrm
--   Extensions (download+install; web and CLI).
--   (Maybe) CiviRules
--   (Maybe) CSS override
--   (Maybe) *.extra.tpl

docs/extend.md

-# Creating CiviCRM Extensions
-
-This page is moving. See [writing extensions](/extensions/basics).
-
-<!--
-TODO:
-- delete this page after redirection in place
--->

mkdocs.yml

@@ -73,12 +73,8 @@ pages:
   - Using hooks: hook.md                        # page-tree = NEED_PAGE_MOVE to /hooks/usage.md
 - MISC TO REORGANIZE OR DELETE:
   - Extension advanced patterns: extensions/advanced.md
-  - Customizing Screens: extensions/customize-screens.md
   - Extensions files: extensions/files.md
   - Some of the hooks: hooks-db.md
   - Requirements: requirements.md
-  - Build: build.md
-  - Customize: customize.md
-  - Extend: extend.md
   - Develop: develop.md
   - hookref-old: hookref-old.md