Restructure config | Move some to a packer plugin | Lot of cleanup

* move teleacope files, updater and related utils to
  https://github.com/NvChad/core

* restructure config file and directory structure

* expose mappings for better escape

* allow multiple mappings for some

* improve merge table function for the same

* move autocommands to a seperate file

* rearrange everything alphabetically where sanely possible

* rearrange packer plugin list on the basis of trigerred state

config structure now

 .
├──  init.lua
├──  LICENSE
├──  lua
│  ├──  chadrc.lua
│  ├──  colors
│  │  ├──  highlights.lua
│  │  ├──  init.lua
│  │  └──  themes
│  │     ├──  chadracula.lua
│  │     ├──  everforest.lua
│  │     ├──  gruvchad.lua
│  │     ├──  javacafe.lua
│  │     ├──  mountain.lua
│  │     ├──  norchad.lua
│  │     ├──  one-light.lua
│  │     ├──  onedark.lua
│  │     ├──  tokyonight.lua
│  │     └──  tomorrow-night.lua
│  ├──  core
│  │  ├──  autocmds.lua
│  │  ├──  init.lua
│  │  ├──  mappings.lua
│  │  ├──  options.lua
│  │  └──  utils.lua
│  ├──  default_config.lua
│  └──  plugins
│     ├──  configs
│     │  ├──  autopairs.lua
│     │  ├──  autosave.lua
│     │  ├──  bufferline.lua
│     │  ├──  chadsheet.lua
│     │  ├──  compe.lua
│     │  ├──  dashboard.lua
│     │  ├──  gitsigns.lua
│     │  ├──  icons.lua
│     │  ├──  lspconfig.lua
│     │  ├──  luasnip.lua
│     │  ├──  nvimtree.lua
│     │  ├──  others.lua
│     │  ├──  statusline.lua
│     │  ├──  telescope.lua
│     │  ├──  treesitter.lua
│     │  └──  zenmode.lua
│     ├──  init.lua
│     └──  packerInit.lua
└──  README.md

lua/plugins/configs/luasnip.lua

@@ -0,0 +1,66 @@
+local present, luasnip = pcall(require, "luasnip")
+if not present then
+   return
+end
+
+local t = function(str)
+   return vim.api.nvim_replace_termcodes(str, true, true, true)
+end
+
+local check_back_space = function()
+   local col = vim.fn.col "." - 1
+   if col == 0 or vim.fn.getline("."):sub(col, col):match "%s" then
+      return true
+   else
+      return false
+   end
+end
+
+_G.tab_complete = function()
+   if vim.fn.pumvisible() == 1 then
+      return t "<C-n>"
+   elseif luasnip and luasnip.expand_or_jumpable() then
+      return t "<Plug>luasnip-expand-or-jump"
+   elseif check_back_space() then
+      return t "<Tab>"
+   else
+      return vim.fn["compe#complete"]()
+   end
+end
+_G.s_tab_complete = function()
+   if vim.fn.pumvisible() == 1 then
+      return t "<C-p>"
+   elseif luasnip and luasnip.jumpable(-1) then
+      return t "<Plug>luasnip-jump-prev"
+   else
+      return t "<S-Tab>"
+   end
+end
+
+_G.completions = function()
+   local npairs
+   if not pcall(function()
+      npairs = require "nvim-autopairs"
+   end) then
+      return
+   end
+
+   if vim.fn.pumvisible() == 1 then
+      if vim.fn.complete_info()["selected"] ~= -1 then
+         return vim.fn["compe#confirm"] "<CR>"
+      end
+   end
+   return npairs.check_break_line_char()
+end
+
+vim.api.nvim_set_keymap("i", "<CR>", "v:lua.completions()", { expr = true })
+vim.api.nvim_set_keymap("i", "<S-Tab>", "v:lua.s_tab_complete()", { expr = true })
+vim.api.nvim_set_keymap("s", "<S-Tab>", "v:lua.s_tab_complete()", { expr = true })
+vim.api.nvim_set_keymap("i", "<Tab>", "v:lua.tab_complete()", { expr = true })
+vim.api.nvim_set_keymap("s", "<Tab>", "v:lua.tab_complete()", { expr = true })
+
+luasnip.config.set_config {
+   history = true,
+   updateevents = "TextChanged,TextChangedI",
+}
+require("luasnip/loaders/from_vscode").load()