Add glow: the markdown previewer

Currently using my own fork, will change to upstream once
the PR is accepted.

lua/core.lua

@@ -28,3 +28,4 @@ global.neoformat_basic_format_trim = 1
 
 -- leader settings
 global.mapleader = ' '
+global.glow_border = "rounded"

lua/mappings.lua

@@ -15,6 +15,7 @@ vim.api.nvim_set_keymap('', '<A-K>', '<C-w>K', {})
 vim.api.nvim_set_keymap('', '<A-L>', '<C-w>L', {})
 vim.api.nvim_set_keymap('', '<A->>', '<C-w>>', {})
 vim.api.nvim_set_keymap('', '<A-<>', '<C-w><', {})
+vim.api.nvim_set_keymap('', '<A-T>', '<C-w>T', {})
 -- undo to the last , . or !
 vim.api.nvim_set_keymap('i', ',', ',<c-g>u', {noremap = true})
 vim.api.nvim_set_keymap('i', '.', '.<c-g>u', {noremap = true})

lua/pluginList.lua

@@ -162,4 +162,9 @@ return require('packer').startup(function(use)
 
     -- integrations
     use {"tpope/vim-fugitive", cmd = "G"}
+    use {
+        "JuanCldCmt/glow.nvim",
+        branch = 'main',
+        cmd = {"Glow", "GlowInstall"}
+    }
 end)