Replace vim-airline with a custom statusline

Finally got round to making a custom statusline after being inspired by
https://pastebin.com/Fm1NEgBf

vimrc

@@ -23,14 +23,6 @@ endif
 set runtimepath+=~/.config/work
 set packpath+=~/.config/work
 
-" vim-airline - improved status bar
-Pack 'vim-airline/vim-airline'
-let g:airline#extensions#branch#enabled = 0
-let g:airline#extensions#hunks#enabled = 0
-let g:airline#extensions#wordcount#enabled = 0
-for s:setting in ['left_sep', 'right_sep', 'section_error', 'section_warning']
-  exec 'let g:airline_'.s:setting.' = ""'
-endfor
 " tabline.vim - sanely numbered tabs
 Pack 'mkitt/tabline.vim'