Cleaned out some last remaining custome variable and ido stuff.
  Changes:
  - Added custom.el to .gitignore
  - Updated gc-cons-threshold comment (removed flx-ido reference)
  - Changed yasnippet to use yas-completing-read instead of yas-ido-prompt (works with vertico)
  - Removed commented-out old package list
.DS_Store
auto-save-list/
eshell/
elpa/
ido.last
*~
transient/
smex-items
custom.el