added bootstrapping for packer

lua/lennartalff/packer.lua

@@ -1,4 +1,16 @@
-vim.cmd [[packadd packer.nvim]]
+-- packer bootstrapping
+local ensure_packer = function()
+    local fn = vim.fn
+    local install_path = fn.stdpath('data') .. '/site/pack/packer/start/packer.nvim'
+    if fn.empty(fn.glob(install_path)) > 0 then
+        fn.system({ 'git', 'clone', '--depth', '1', 'https://github.com/wbthomason/packer.nvim', install_path })
+        vim.cmd [[packadd packer.nvim]]
+        return true
+    end
+    return false
+end
+
+local packer_bootstrap = ensure_packer()
 
 return require('packer').startup(function(use)
     -- Packer can manage itself
@@ -25,7 +37,7 @@ return require('packer').startup(function(use)
         requires = {
             -- LSP Support
             { 'neovim/nvim-lspconfig' }, -- Required
-            {                            -- Optional
+            {                 -- Optional
                 'williamboman/mason.nvim',
                 run = function()
                     pcall(vim.cmd, 'MasonUpdate')
@@ -34,9 +46,9 @@ return require('packer').startup(function(use)
             { 'williamboman/mason-lspconfig.nvim' }, -- Optional
 
             -- Autocompletion
-            { 'hrsh7th/nvim-cmp' },     -- Required
+            { 'hrsh7th/nvim-cmp' }, -- Required
             { 'hrsh7th/cmp-nvim-lsp' }, -- Required
-            { 'L3MON4D3/LuaSnip' },     -- Required
+            { 'L3MON4D3/LuaSnip' }, -- Required
             { 'mhartington/formatter.nvim' },
         }
     }

plugin/packer_compiled.lua

@@ -89,6 +89,11 @@ _G.packer_plugins = {
     path = "/home/lennartalff/.local/share/nvim/site/pack/packer/start/formatter.nvim",
     url = "https://github.com/mhartington/formatter.nvim"
   },
+  ["gitsigns.nvim"] = {
+    loaded = true,
+    path = "/home/lennartalff/.local/share/nvim/site/pack/packer/start/gitsigns.nvim",
+    url = "https://github.com/lewis6991/gitsigns.nvim"
+  },
   ["lsp-zero.nvim"] = {
     loaded = true,
     path = "/home/lennartalff/.local/share/nvim/site/pack/packer/start/lsp-zero.nvim",