Move ftplugin directory, add nvim-r plugin

.config/vim/ftplugin/c.vim

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+setlocal colorcolumn=81

.config/vim/ftplugin/cpp.vim

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+setlocal colorcolumn=81

.config/vim/ftplugin/tex.vim

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+" General
+setlocal cmdheight=1
+setlocal colorcolumn=81
+setlocal textwidth=80
+
+" Document structuring
+nnoremap ;be i\begin{(<>)}<Return><Tab><Return>\end{(<>)}<Esc>kk^
+
+" Text formatting
+inoremap ;b \textbf{}(<>)<Esc>T{i
+inoremap ;i \textit{}(<>)<Esc>T{i
+inoremap ;u \underline{}(<>)<Esc>T{i
+inoremap ;e \emph{}(<>)<Esc>T{i
+
+" Next section
+noremap <silent> .. <Esc>/(<>)<Enter>"_c4l