nvim: Add telescope digraph search

Added plugin for digraph search through telescope.
When you want to enter a digraph, you can do so through the usual
method, pressing <c-k> and then entering the digraph shortcut (e.g.
`<c-k>OK` for ✓, or `<c-k>n?` for ñ) OR you simply double press
<c-k><c-k> which opens a quick telescope window to select the digraph
you want.

nvim/.config/nvim/lua/maps.lua

@@ -261,3 +261,7 @@ map.n.nore['[c'] = ':IPythonCellPrevCell<cr>'
 -- insert cell header above/below
 map.n.nore['<leader>cO'] = ':IPythonCellInsertAbove<cr>a'
 map.n.nore['<leader>co'] = ':IPythonCellInsertBelow<cr>a'
+
+-- PLUGIN: betterdigraphs
+-- allow normal digraph insertion on c-k, search on c-k c-k
+map.i.nore['<C-k><C-k>'] = '<Cmd>lua require "betterdigraphs".digraphs("i")<CR>'

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

@@ -165,6 +165,10 @@ require("packer").startup(function()
         },
         config = function() require('plug._telescope') end
     }
+    use {
+        'protex/better-digraphs.nvim',
+        requires = {{"nvim-telescope/telescope.nvim"}}
+    }
 
     -- snippeting
     use {"hrsh7th/vim-vsnip", event = "InsertEnter"} -- snippet engine