nvim: Replace surround plugin for vim-sandwich

Finally made the switch from the lua surround plugin of my choice to
sandwich -- it provides sane defaults, needs little to no setup, and
comes with a pretty alright default mapping method:

`sa<object><something>` to add surroundings to object
`sr<oldsurround><newsurround>` to replace surroundings (including
`srb<new>` for automatically figuring out what to replace)
`sd<surround>` to delete existing.

Simple and efficient, should make the cut in my estimation.

nvim/.config/nvim/lua/plugins.lua

@@ -57,18 +57,7 @@ require("packer").startup(function()
 
     -- editing
     use {'tpope/vim-commentary', event = "BufRead"} -- easily toggle comments for lines, paragraphs etc with gc
-    use {
-        'blackCauldron7/surround.nvim', -- lets you change surrounding things with cs (or ds to del, ys to add)
-        config = function()
-            vim.g.surround_mappings_style = "surround"
-            vim.g.surround_pairs = {
-                nestable = {{'(', ')'}, {'[', ']'}, {'{', '}'}},
-                linear = {{"'", "'"}, {'"', '"'}, {'*', '*'}, {'`', '`'}}
-            }
-            require('surround').setup {}
-        end,
-        event = "BufRead"
-    }
+    use {'machakann/vim-sandwich', event = "BufRead"} -- surround things with other things using sa/sd/sr
     use {
         'monaqa/dial.nvim', -- extend the ^a / ^x possibilities to dates, hex, alphabets, markdown headers
         event = "BufRead"