nvim: Drop vim-markdown

This plugin results in the odd grey high lighting seen in floating
windows when using hover with nvim-lsp. See the below issue.
https://github.com/neovim/neovim/issues/12543

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/init.vim

@@ -101,7 +101,6 @@ Plug 'wsdjeg/vim-lua'
 Plug 'georgewitteman/vim-fish'
 Plug 'elzr/vim-json'
 Plug 'lifepillar/pgsql.vim'
-Plug 'plasticboy/vim-markdown'
 Plug 'mtdl9/vim-log-highlighting'
 Plug 'martinda/Jenkinsfile-vim-syntax'
 

nvim/.config/nvim/plugin_settings.vim

@@ -34,8 +34,6 @@ let $FZF_DEFAULT_OPTS='--layout=reverse'
 " Incremental search
 let g:incsearch#auto_nohlsearch = 1
 
-" Markdown
-let g:vim_markdown_conceal = 0
 " C/CPP
 let g:cpp_class_scope_highlight = 1
 let g:cpp_member_variable_highlight = 1