Drop ale plugin and config

vimrc

@@ -70,14 +70,6 @@ if has("win32")
 endif
 let g:coc_default_semantic_highlight_groups = 0
 
-" ale
-let g:ale_sign_error = '▸'
-let g:ale_sign_warning = '▸'
-let g:ale_echo_msg_format = '[%linter%] %s (%code%)'
-let g:ale_linters = {'c': [], 'cpp': []}
-let g:ale_cmake_cmakelint_options =
-      \ '-convention/filename,-package/consistency,-package/stdargs'
-
 " vim-signify
 let g:signify_sign_change = '~'