Gut vim configs to remove external deps

Now that we use Helix, let's pare back vim a bit. This mainly drops
vundle and anything depending on something installed by vundle. Doing
this removes the external plugins, closes a security concern, reduces
the number of steps I need to take to bootstrap my homedir on a new
host, and cuts a lot of cruft out of my homedir.

The only loss here is ALE on systems that lack Helix, but if I'm going
to use vim to write code, I should use vim-lsp or something instead for
consistency with Helix.

.vimrc

@@ -9,41 +9,12 @@ set nocompatible
 " Make backspace work as expected on all platforms
 set backspace=indent,eol,start
 
-" Start Vundle, temporarily set some values
-set rtp+=~/.vim/bundle/Vundle.vim
-filetype off
-call vundle#begin()
-
-" Plugin execution
-Plugin 'VundleVim/Vundle.vim'
-Plugin 'vim-pandoc/vim-pandoc'
-Plugin 'vim-pandoc/vim-pandoc-syntax'
-Plugin 'tpope/vim-surround'
-Plugin 'mhinz/vim-startify'
-Plugin 'vim-airline/vim-airline'
-Plugin 'dense-analysis/ale'
-Plugin 'elixir-editors/vim-elixir'
-Plugin 'rodjek/vim-puppet'
-
-" End Vundle startup, reset changed values as desired
-call vundle#end()
-filetype plugin indent on
-
-" Formatters for ale to reformat documents into a unified structure
-let g:ale_fixers={
-	\'*': ['remove_trailing_lines', 'trim_whitespace'],
-	\'python': ['autopep8', 'black', 'isort'],
-	\'elixir': ['mix_format']
-	\}
-
 " Visual themeing
 set termguicolors               "Enable 256 colors
 set t_Co=256                    "Limit vim to 256 colors
 set scrolloff=5                 "Always display 5 lines below cursor when scrolling
 colorscheme base16              "Use my custom built color scheme
-let g:airline_theme='base16'    "Use the scheme for airline too
 set background=dark             "Inform vim I use a black background terminal
-let g:airline_powerline_fonts=1 "Use powerline glyphs in airline
 
 " Set UTF-8 default
 set encoding=utf-8
@@ -59,7 +30,7 @@ set ignorecase  "ignore case in search
 set smartcase   " ...unless you specify case yourself
 
 " Tabs and Whitespace
-set breakindent "add soft indents when soft wrapping
+set breakindent     "add soft indents when soft wrapping
 set autoindent      "try to figure out automatic indents while writing code
 set smartindent     " ...and try to figure it out based on language
 set nowrap          "don't soft wrap by default
@@ -76,44 +47,6 @@ set wildignorecase
 " Syntax Highlighting
 syntax on
 
-" Word count in plaintext formats
-let g:airline#extensions#wordcount#enabled=1
-let g:airline#extensions#wordcount#filetypes=['help', 'markdown', 'rst', 'org', 'text', 'asciidoc', 'tex', 'mail', 'pandoc']
-
-" Directories for backup files
-set backupdir=~/.vim/backup
-set directory=~/.vim/backup
-
-" Disable markdown spelling by default
-let g:pandoc#modules#disabled=["spell"]
-
-" Fixes to pandoc's rules to make markdown less ugly
-let g:pandoc#syntax#codeblocks#embeds#langs=["python", "bash=sh", "sh"]
-let g:pandoc#syntax#conceal#blacklist=["ellipses", "quotes"]
-let g:pandoc#syntax#conceal#urls=1
-
-" Create the file if you follow an orphaned link
-let g:pandoc#hypertext#create_if_no_alternates_exists=1
-
-" Make link follows split horizontally since most of my terms are tall
-" Also work around a netrw bug that opens everything no-modify
-let g:pandoc#hypertext#split_open_cmd="botright split +set\\ modifiable"
-
-" Allow folding at fold markers to let me collapse sub-sections of lists
-let g:pandoc#folding#vim_markers_in_comments_only=0
-
 " Unfold everything by default
 set foldlevel=99
 
-" Bracketed paste
-let &t_ti=&t_ti . "\e[?2004h"
-let &t_te="\e[?2004l" . &t_te
-function XTermPasteBegin(ret)
-	set pastetoggle=<Esc>[201~
-	set paste
-	return a:ret
-endfunction
-map <expr> <Esc>[200~ XTermPasteBegin("i")
-imap <expr> <Esc>[200~ XTermPasteBegin("")
-cmap <Esc>[200~ <nop>
-cmap <Esc>[201~ <nop>