feat(nvim): add Treesitter text objects

roles/neovim/files/after/plugin/treesitter.lua

@@ -17,7 +17,20 @@ configs.setup {
   },
   matchup = {
     enable = true,
-  }
+  },
+  textobjects = {
+    select = {
+      enable = true,
+      lookahead = true,
+
+      keymaps = {
+        ["af"] = "@function.outer",
+        ["if"] = "@function.inner",
+        ["ac"] = "@class.outer",
+        ["ic"] = "@class.inner",
+      },
+    },
+  },
 }
 
 local nmap = require "opdavies.keymap".nmap