Refactor: Test & Doc: Remove test/vader_include and move DesignNotes to doc

- vader_include is declareing functions -> faster to load (parse) once in
vimrc
- DesignNotes is doc so goes to doc

test/independent_runs/map.vader

@@ -1,6 +1,3 @@
-Include: vader_setup
-
-
 # 0 Configure {{{1
 ##################
 
@@ -566,5 +563,4 @@ Expect (Like 'aH', but excluding the header itself):
   # Head2
   content 2
 
-Include: vader_teardown
 # vim: foldmethod=marker foldlevel=30 sw=2

test/independent_runs/search.vader

@@ -1,5 +1,3 @@
-Include: vader_setup
-
 Execute (Setup search testing wrapper):
   function! TestSearch(search_command, test_name)
     " Note: after each search, the location list of the current window (0)
@@ -62,5 +60,3 @@ Execute (Search failure message):
   silent VimwikiSearch not_exist
   redir END
   Assert match(output, 'VimwikiSearch: No match found.') > -1, "expected custom error"
-
-Include: vader_teardown