helix: add some keybinds

dot_config/helix/config.toml

@@ -35,3 +35,19 @@ render = true
 
 [editor.soft-wrap]
 enable = true
+
+[keys.normal]
+C-s = ":w"
+C-o = "file_picker"
+S-ret = ["open_below", "insert_mode"]
+
+E = "extend_to_line_end"
+x = "extend_to_line_bounds"
+X = "extend_line_below"
+
+d = "delete_selection_noyank"
+A-d = "delete_selection" 
+c = "change_selection_noyank"
+A-c = "change_selection"
+
+S-v = ["extend_to_line_bounds","select_mode"]