helix: new menu entries

ff: file_picker
fw: write file
<spc>wc: buffer-close
<spc>cx: quit

dot_config/helix/config.toml

@@ -40,10 +40,12 @@ render = true
 enable = true
 
 [keys.normal]
-C-s = ":w"
-C-o = "file_picker"
-S-ret = ["open_below", "insert_mode"]
+f = { f = "file_picker", w = ":write" }
 
+space = { w = { c = ":bc" }, c = { x = ":q" } }
+C-w = { c = ":buffer-close" }
+
+B = "extend_to_line_start"
 E = "extend_to_line_end"
 x = "extend_to_line_bounds"
 X = "extend_line_below"
@@ -54,3 +56,4 @@ c = "change_selection_noyank"
 A-c = "change_selection"
 
 S-v = ["extend_to_line_bounds","select_mode"]
+S-ret = ["open_below", "insert_mode"]