feat(nvim): add snippets for luasnip

Add friendly snippets and load them with luasnip.

modules/programs/nvim/default.nix

@@ -70,6 +70,7 @@ in
           cmp_luasnip
           copilot-cmp
           direnv-vim
+          friendly-snippets
           lsp_lines-nvim
           lspkind-nvim
           lspsaga-nvim-original

modules/programs/nvim/init.lua

@@ -14,6 +14,7 @@ vim.api.nvim_create_autocmd("InsertEnter", {
   callback = function()
     local cmp = require("cmp")
     local luasnip = require("luasnip")
+    require("luasnip.loaders.from_vscode").lazy_load()
     require("copilot_cmp").setup()
 
     cmp.setup({